I'm going to say beating Iron Man 3 is guaranteed, and Age of Ultron worldwide is definitely on the table. As has been said, regardless of the story/themes and framing, this is functionally an Avengers movie. An Avengers movie with more hype leading into it than Ultron. And fucking Spiderman joining the gang. It's going to be huge.
That extra $100,000,000 to beat Avengers 1 though... That's going to be interesting. I'm not quite convinced it will hit, but honestly it wouldn't surprise me that much.
Beating Jurassic World... That'll be tough as fuck.
And anyone who thinks this will come within spitting distance from TFA on any major metric (outside of Chinese total) is completely and totally fucking insane. $2b won't happen. At all. The only movies with a chance of doing that in the next decade have Avatar in the title. And who knows how the fuck those will do.
Anyway. I'm going to put my prediction at... ~1.45b.