Ultron, Loki if he wasn't defeated in the Thor movie (I didn't see it) it would be great to see Thor say "Loki! Prepare for battle!"

well, according to my observations, (I don't google answers) Hollywood which aimed for mainstream and they have yet to make a real 'team' movie (X-men focused too much on certain characters) I think they' should adapt the Ultimates storyline with Hulk as the opponent and then Loki and the Skull in cahoots. But again, knowing H-wood, they'll do a lame movie with Iron Man in central stage. Oh, Black Widow is in the movie....check out my Cap review for the trailer for Avengers....