I have a *strong* feeling that it'll actually be Widow who provides the "calming" influence on Banner/Hulk. There've already been rumors that Natasha is supposed to be at least flirty with Banner, and some of the leaked script (real or not) had references to her kinda talking Hulk down to keep his rage in check.
I wouldn't put a "Beauty and the Beast" motif past Joss Whedon, the unabashed "girl power" guru of nerdfilm, at all.
Yeah, too bad Hulkster snuffed the "feeble flame" of your magic hands with a mere twitch of his big green meathooks, eh, Doc....?
In other semi-related news: looks like the Dr. Strange movie is getting closer to becoming a reality....a Disney fansite found Disney establishing domain names for a slew of Marvel-related soundtrack sites, including Avengers, IM3, Thor 2 and....yes, Dr. Strange. So I'd say the Sorcerer Supreme is definitely on Marv's fast track now.