Entertainment Earth has the first wave up for pre-order:

Batman, Riddler, Penguin:
http://www.entertainmentearth.com/prodinfo.asp?number=MTY9633AA#.UU_L7lcav3B

Batman/Robin 2-pack:
http://www.entertainmentearth.com/prodinfo.asp?number=MTBBJ45#.UU_Lk1cav3B

"The important question is not, are there aliens on other worlds? No. The important question is, do they have ray guns?"