One mystery solved. The movie Disney and Marvel plan to release on their long-staked May 6, 2016 release date is Captain America 3, according to The Hollywood Reporter.
Not totally unexpected news, as we knew the film was coming (and more recently that Winter Soldier's Joe and Anthony Russo would be returning to direct it) but it's good to have some clarification. Chris Evans, of course, will be back as Cap, for potentially one of his last appearances.
The only question remains whether Batman vs Superman moving off the date will come to fruition. Kinda hope not, right?