Four brand new trailers for Marvel: Ultimate Alliance are available to Xbox 360 owners on Xbox Live Marketplace. They are:

-Marvel: Ultimate Alliance Game Trailer
-Marvel: Ultimate Alliance Opening Cinematic Trailer
-Marvel: Ultimate Alliance Nightcrawler Cinematic Trailer
-Marvel: Ultimate Alliance Behind-The-Scenes Video

The trailers are free to download in all regions except Austria, Japan, Switzerland, Taiwan.

Thanks to Major Nelson for the info