DC Press Release here.
The new LEGO DC Universe SUPER HEROES collection will feature 13 iconic super heroes in LEGO minifigure form, including: Batman™, Robin™, Catwoman™, The Joker, The Riddler™, Two-Face, Poison Ivy, Harley Quinn™, Bane, Bruce Wayne, Superman™, Lex Luthor™ and Wonder Woman™. Buildable characters will include Batman, The Joker and Green Lantern. Select figures will be on display in the LEGO booth (#2829) at Comic-Con International at the San Diego Convention Center July 21-24.
Oh, and it looks like Lego has a preliminary site up with several contests. That would be here.