Now that BBM has remembered that they have a web site, they're catching up on the sets that AmiAmi and Discount Niki have been listing. Next up is the 2011 "Historic Edition" set which this year features the theme of "Hometown Heroes". If I'm reading the translation right, there is at least one OB player in the set from each of Japan's 47 prefectures and at least one active player in the set from each prefecture except Shimane (which according to Wikipedia is the second least populous prefecture in Japan).
As always, the set will contain 144 cards - 72 OB players and 72 active players. There are two insert sets - "Pride Of the Hometown" featuring OB players and "Active Stars In Japan" which is kind of self explanatory. There's also photo cards and autograph cards available and a couple parallel versions of the OB "regular" cards and the insert cards. The set will be out in late November.