Got this news from MajorSpoilers today:
Ross, a classic “Hulk” character from the comic book’s beginning in 1962, is Banner’s fellow scientist and an ally in his quest to rid him of his lurking monster deep inside. The movie will unfold with Ross estranged from Banner (Norton), but with the pursuit of the Hulk heating up and Banner on the run trying to cure his condition, Ross finds herself swept back into his life.
More to read. (Thanks, Stephen!)