I support a new Hulk movie with Mark Ruffalo, but by 2015? Would the hype still be around and be enough to make that a successful movie? Maybe if Ruffalo is in Iron Man 3 and wows like he did in the Avengers it'll be successful.
The best part about all these avenger movies intertwining is there really is no way to know who's going to show up. I heard some Internet rumblings that Antman has been confirmed for 2014 so that's pretty awesome. Now, if only we could get fox and others on board so we can get wolverine and spiderman in there too.