No. Way. Really?! I wonder to what capacity.
Maybe after civil war comes out, they will have enough characters for an ensemble type show/ride instead of a standalone hero, a ride where you come face to face with black panther, falcon, ant-man fighting a generic ultron type army thing using enough B Heroes without using any of the off limits characters? etc...
Hulk meet-greet-and-grunts at EPCOT's World Showcase? Just give me a little time here ... and doncha think Howard the Duck would make a good replacement for Living With the Land? Or better yet ... how about adding him to a new version of The Tiki Room. You know the #tikibless and #cultofcitrus would groove on that.
It is generally believed that Guardians would be ok. It seems pretty clear the Universal isn't looking to get ride of Marvel so maybe a deal was cut to allow some off limits characters to be used at WDW.
Anything not used by Universal first (in any capacity) is fair I believe, but Universal used all the A-list characters already. So guardians is the only thing they've made so far that wouldn't apply because those were obscure characters before the films.