Possible 1 week before the release of BvS?
Brazilian website
website Judão reveal that their sources at Warner Bros. Brazil have told them that the movie will open in the South American country on April 28th, 2016 (new films are released there on a Thursday), and while this branch of Warner Bros. tells them that theyre still waiting for 100% confirmation, word is that the US release date of Batman Vs. Superman has also been moved up to April 29th instead of May 6th.
Thats a week before, and an easy way to save face for the studio. After all, fans feeling grateful to have the highly anticipated Zack Snyder helmed movie seven days earlier will hopefully
pay more attention to that than the fact that theyre seemingly backing down from Marvel. This also gives Batman Vs. Superman a clear week at #1 before it has to contend with whatever Kevin Feige and company has in mind for that date.
source:
http://www.heyuguys.co.uk/sources-warner-bros-claim-batman-vs-superman-will-back-marvels-2016-movie/