Edward Norton's Hulk was the first that Marvel movie fans got to know. Many still say that the character was better, that the comic book hero had a more aligned personality than was already known than when the recast happened. Others say that the change was actually positive and the more "human" Hulk was just what Marvel's shared movie universe needed.
Anyway Captain America 4 is still being filmed and it brings back Liv Tyler's Betty Ross! The character is the daughter of General Ross who was rumored to be the "Red Hulk". With the whole idea of the new saga being about the multiverse it's no surprise that old characters make an appearance. But if Betty Ross is back we could see more than one Hulk playing together! There's also a chance her return means her villainous moment in the comics could be coming true in the movies.
Whatever the story line, we can already see that marvel's work will be bigger and with more characters in the new phase!