The guy who does those I'm a Marvel, I'm a DC videoes has a hilarious one of 'worse case scenarios' for how it could go (from before the release, obviously)
also be sure to check out the Batman/Avengers one for post-movie.
Yeah the Marvel/DC videos are brilliant too. I like a recent one with Batman sparring with The Avengers over whose will be the bigger movie and with Spider-Man standing there going: "Oh, come on guys! I'm right here!"