WizKids will release DC HeroClix:  Batman Four-Figure Booster on June 4th, during the run-up to the next Batman film, which will premiere on July 18th (see "Best in Shows, Part 1").  The window box will display one of four Batman figures, with three other figures hidden.  The 30-figure set will include Batman allies such as Robin and Commissioner Gordon, and villains such as Joker and Two-Face. 

The boosters will also include four character cards, a fully playable Gotham City map section (two sections can be used together for a huge play map), rules sheet, and two dice.  MSRP will be $9.99.