If you have any slight inkling of the Marvel universe (that or Google), it’s pretty obvious. At first glance, my first guess was actually Galactus then it struck me who it was.
Definitely the new villain for The Avengers 2 and judging from the number of people watching the movie, I’m pretty sure plans for the sequel is already underway.
Movie was awesome by the way and not cheesy in any way at all. 😀