Currently Joss Whedon [creator of Buffy the Vampire Slayer] has been tagged as the director for the future Avengers film [rumored to be a 3D feature]. It is slated to happen somewhere down the road, after the Thor and Captain America flicks.
It almost looks like they're set for a battle... these two pics are part of a much larger banner image, which I did several months ago. I was just starting out this blog back then: http://dsngsfm.blogspot.com/2010/09/x-men.html
If you're a long-time Marvel fan, you should be able to identify all the characters in that X-men poster.