Captain America 2 The Winter Soldier. The trailer looks great. The number of characters involved makes it seem like it will be a really fast paced and action filled movie. Now that the Avengers movie has already been released these new Marvel movies can dive further into the stories and characters featured. I don't recognize all of the characters involved but it seems like some of the new ones are other Avenger characters. Ones that weren't featured in the last Avenger's movie. Also you have to watch all of the movies just to make sure that you will know what is going on in the next Avengers movie.
http://www.youtube.com/watch?v=NLWsK1ZFunA#t=35
