Calbee's website is now listing information for their second series of the year. The set includes 96 "regular" cards (8 per team), four checklist card and a 12 card "Hot Player" subset. There are also subsets labeled "OP", "S" and "V" and I have no clue what they might be.
I don't see a release date for the set, so I don't know when it will be out. Come to think of it, I don't know if Series 1 ever came out. I assume it was out in March or April.
Update: According to a comment from Deanna, the "OP" cards are "Opening Game" cards, the "S" subset are "Star" cards and the "V" subset are "Veteran" cards. Each subset is an even multiple of 12, so you can expect that each team will be evenly represented.