Also, Cosmic Book News says that Cranston has signed on for six (!) appearances as Lex:
Bryan Cranston has been cast as Lex Luthor in what is said to be at least a six “appearance” deal (think of Samuel L. Jackson as Nick Fury popping up in every Marvel movie in the run-up to Avengers) and may be as high as ten.
Look for the official announcement to follow the conclusion to the final season of Breaking Bad as WB wants to dovetail off the end of that. Regarding Ben Affleck, we are told he has allegedly a 13-appearance deal for Batman.
DC is going to have all of their main characters liberally appearing or at least mentioned in all of their movies to portray a more connected world than what Marvel Studios has done so far.
And I'm not 100% sure if you should buy this rumor, but Cosmic also reports that none other than Matt Damon is being considered for the role of Aquaman. Vinny Chase, congrats: you're off another movie.