Size: 313 cards (cards numbered 337-600, then 12 cards of "Ceremonial First Pitch" subset are separately numbered FP01-FP13 and 36 cards for "Cross Freeze" subset are separately numbered CF37-CF72)
Cards Per Team: 19 (team card + 18 players)
Team Card Theme: Mascots
Number Of Leader Cards: N/A
Checklists: 0
Subsets: 1st Version Update (36), Ceremonial First Pitch (13), Cross Freeze (36)
Inserts: One And Only
Memorabilia Cards: Undershirt cards for Louis Okoye, jersey cards for Shun Takayama and a "Combination" undershirt & jersey card with both of them.  The single jersey cards are numbered to 100 while the "Combination" card is numbered to 10.  There's 30 different players who have autographed cards (3 per team but none from the Giants or Carp).  Seven of those 30 have what I think is a separate autograph card.  Four of the "Ceremonial First Pitch" cards have an authentic autograph version.
Parallels: 15 of the 1st Version Update and 57 of the regular player cards have five different facsimile autograph parallels.  I think that they are silver (unnumbered), gold (numbered to 100), hologram (numbered to 50), red (numbered to 25) and green (numbered to 10).  There are two parallels for the "Cross Freeze" cards - one is limited to 100 and the other is a "1 of 1".  There is a parallel (limited to 100) for the One And Only insert cards.
Notable Rookies: Jun Hasegawa

This year's edition of BBM's 2nd Version set came out a couple weeks back.  The regular cards in the set feature something a bit rare for BBM's flagship sets - borders.  I don't necessarily view this as a good thing as one of the things I like most about BBM's flagship sets is the full bleed photos.  This is the second year in a row where the 2nd Version set has had borders and I don't like the trend.

On the positive side, however, this set appears to signal a change in the "batters batting, pitchers pitching" photo monotony that's been common in BBM's sets lately.  There's not a small number of photos featuring players fielding and base running and even a couple candids.  I also like that there's a variety of uniforms represented in the photos - throwbacks for the Tigers and Baystars and alternates for the Swallows and Giants (and I'll be updating the uniform posts with some of these soon).  So while I don't like the borders, I do like the photos.  Here's a bunch of examples:

#442

#587

#570

#451

#548

#508

#417

#521

I will make my usual 2nd Version set complaint that some of the poses for players are very similar between their 1st and 2nd Version cards:

2016 BBM 1st Version #098 (left) and 2nd Version #444 (right)

2016 BBM 1st Version #173 (left) and 2nd Version #488 (right)

Here's what the back of the cards looks like.  The stats are as of May 30th.

Back of #393 (Kohei Arihara)

The team cards were a bit of a disappointment for me - the theme was mascots.  I guess it was too much to ask that we go an entire year without mascots as a flagship set team checklist theme from BBM...

#594

The set has the usual 36 card "1st Version Update" subset.  This subsets features three cards per team of players who were left out of the 1st Version set for whatever reason.  The cards are done using the design of the 1st Version set.  This year's subset includes several foreign players (Drew Naylor, Pat Misch, Yamaico Navarro and Mike Zagursky) along with veteran players like Shota Dobayashi, Hitoki Iwase, Yuya Hasegawa, Shogo Kimura and Yoshihisa Naruse.

#368

#349

There's a rookie card for Jun Hasegawa of the Giants included in the subset.  It's rare that the subset includes a rookie card as usually all the non-ikusei rookies get included in the 1st Version set.  And in fact the reason that Hasegawa was not included in the 1st Version set was that he was ikusei up until late March when the Giants registered him to the 70 man roster.  So his first flagship card is in this subset (he did also have a card in this year's Rookie Edition set).

#360

Like last year, BBM did not include Shohei Ohtani in the regular 2nd Version cards because they included him in the "1st Version Update" subset.  His 1st Version card this year had him as a pitcher but the Update card has him as a batter and outfielder:

#340

The 2016 version of BBM's annual (practically) cross-set subset is called "Cross Freeze" and 2nd Version has the second (and possibly final) installment of the subset.  Like the 1st Version set, 2nd Version has 36 cards in the subset (3 per team of course).  As always, these cards feature the image of a player superimposed on a background (an icy one this year) and are numbered separately from the rest of the set.

#CF54

The other standard subset for the 2nd Version set is the "Ceremonial First Pitch" subset which features a number of Japanese celebrities throwing out the first pitch at a ball game.  This year's group includes actress/model Norika Fujiwara, gravure idol Ami Inamura, singer Sachiko Kobayashi, actress Sari Kobayashi, model(?) Erika Matsumoto, gravure idol Shizuka Nakamura, gravure idol Hinako Sano, singer Mariko Shinoda, boxer Tomomi Takano, model(?) Momoka Tsukishima and model (and I think Sapporo Beer "image girl") Nagisa Yuzuki.  The cards are numbered separately from the rest of the set.

#FP07

The subset also includes a couple of cards commemorating the first pitch ceremony featuring Sadako from "The Ring" and Kayako (and her son Toshio) from "The Grudge" at the Tokyo Dome on June 1.  This was a promotion for the movie "Sadako vs Kayako" that came out in June.

#FP12 (left) & #FP13 (right)

I picked up the 12 card "One And Only" insert set with the set.  There are 12 cards in the set (one per team) which includes a number of big stars (Ohtani, Yuki Yanagita, Tetsuto Yamada, Yoshitomo Tsutsugoh, Hayato Sakamoto).

#oo01

As usual, all the cards for the set (along with parallels and inserts) can be seen at Jambalaya.

Research for this was a bit difficult.  Engel only lists one of these variants and really doesn't go into any detail about it.  I did some searches on Yahoo! Japan Auctions to see what I could find but that only really helped with one card.  Luckily, however, I had been contacted by a Japanese card collector named Takashi last year who was interested in a trading cards.  One of the cards that Takashi was looking were the Hideki Irabu cards I'll be mentioning in a moment.  I asked him what the story was with those card and he told me.  He also offered to answer any other questions I had about BBM cards and I took him up on the offer and asked about the other cards as well.  While he didn't know about all the cards, he knew much more than I did about them so most of the following should be credited to him.

Here's the list:

1993 BBM #417 Takashi Wada

The original ('a') version of the card has a headshot of Goichi Inokubo on the back rather than Wada.  I'm pretty sure what I have is the corrected ('b') version of the card:

I don't have a copy of the 'a' version but oddly enough, this is the card that Gary Engel uses as an example card for his listing of the 1993 set:

SCM #116 has the 'a' version of the card at 50 yen and the corrected version at 300 yen.

1993 BBM #477 Masanori Murakami

This is the variant that is listed by Engel.  Takashi says "There is a notation error on the back side of the sentence" that was corrected on the 'b' version.  I don't know which version I have but here's the back side of it:

SCM #116 has both versions of this card at 500 yen

1995 BBM #216 and #604 Hideki Irabu

These are kind of odd - technically the variation is with the gold signature parallel versions, not the base card.  The 'a' version of the card is the base version.  The 'b' version of the card has an incorrect gold signature on it - it's Ken Hirano instead of Irabu.  The 'c' version of the card has the corrected signature.  It's weird that the mistake was made on both the regular version of the card (#216) and the "Late Series" version (#604).  I have the 'b' version of card #216 and the 'a' version of card #604.

SCM #116 has the 'a' and 'b' versions of card #216 at 400 yen while the 'c' version is 3000(!) yen.  Version 'a' of #604 is listed at 500 yen while version 'b' is 1000 yen and version 'c' is 800 yen.

1999 BBM #464 Koichiro Yoshinaga

Takashi says that the original version of this card has an incorrect photo but he didn't know any more details about it.  I don't have this card but I found this image on Yahoo! Japan Auctions.  I don't know which version of the card this is although I'm pretty confident that this is Yoshinaga so it's probably the corrected version.  SCM #116 has both versions listed at 50 yen.

1999 BBM 485 Naoyuki Ohmura

This is another case with an incorrect photo (kind of) but I think I understand what happened here.  Notice in the above card that while the player's number on the card is 7, the player's uniform shows #60.  Ohmura had worn #60 prior to 1999 when he switched his number to 7 so I think this is a picture of him with his old number (there's a possibility that this is a picture of Hironori Fujisaki who took uniform #60 in 1999 but it's unlikely as the little bit of the left sleeve patch looks like the one on the 1998 uniforms and Fujisaki was a pitcher).  I don't have the corrected card but I found it on Yahoo! Japan Auctions (and the auction indicated that it was the corrected version):

SCM #116 has both versions of the card at 50 yen.

(And just so you know, Yoshinaga didn't change his number for 1999 so I don't think his card was corrected for that.)

2000 BBM #360 Seigo Fujishima

I've talked about this one before.  This is the only one of these cards that I have both version of.  The one on the left is the original while the one on the right is the corrected version (obviously).  Takashi did not know why the change was made although I think he thinks that the original photo is not Fujishima.  SCM #116 has both cards at 50 yen.

2000 BBM #374 Takashi Yoshida and #377 Yuji Yoshioka

This is another issue with the head shots on the back of the cards - the head shots of the players are switched on the original ('a') version of the cards.  So Yoshioka is on the back of Yoshida's card and Yoshida is on the back of Yoshioka's card:

Yoshioka's facial hair makes it kind of obvious.  I don't have the corrected version of the cards and I couldn't find an image of them.  SCM #116 has all four of the cards at 50 yen.

2001 BBM #284 Taka Miura

This is a fairly straight forward one - the original version of the card has the player's name as "Takashi Miura" rather than "Taka Miura".  Here's the corrected version (from Yahoo! Japan Auctions):

SCM #116 has both versions of the card at....wait for it...50 yen yet again.

I don't know for sure but I'm pretty confident in saying that the corrected versions of the 1999-2001 cards were released as part of BBM's Late Series releases those years.  I don't know how the corrected versions were released for 1993 and 1995 but the corrections may have been somewhat limited which would explain why some versions are more expensive than others.

SCM does not list the Reader/Leader variants from the 2000 BBM set as separate versions but obviously these are another example of corrected cards.

Thanks again to Takashi for all his help.  Anything incorrect here is my fault, not his.