Well, thanks to a tweet from the Hulk himself, Mark Ruffalo, who said that he was "Proud to be a part of the Marvel universe," you can now watch the montage for yourself. In fact -- it's right here, just below this text! And it's really, really cool (especially when it expands out into the galactic stuff).
There are two things that are probably the most mind-boggling about this little montage: one, the fact that they pulled this thing off at all. Just think about it -- separate, huge movies that occasionally feed into one giant superhero team-up movie and features that crisscross in and out of films. It's so complicated and insane and yet Marvel has totally pulled it off (and not only that -- made it look easy). The second thing that really got me while watching this montage in the sweaty bowels of Hall H was that you really care about these characters. Some of these characters, like Thor or Iron Man, were largely unknown to those who don't camp out to get a glimpse of this stuff, but they have all permeated the popular culture, become part of the zeitgeist and become characters who we root for and have a genuine emotional investment in.
Marvel has created an impressive achievement, on both a commercial and artistic level, and the sheer complexity boggles the mind. So just soak it up and enjoy. These are characters who you don't mind rooting for.