Marvel have released a featurette and an extended spot for Captain America: The Winter Soldier.
Battle for the Avengers Tower 360°
The Avengers battle Ultron's minions in this 360 degree video (available on Android phones or Google Chrome).
The Amazing Spider-Man 2 - Clip + Scoring Featurette
Here's a clip from The Amazing Spider-Man 2, and a featurette about scoring the film.
X-Men: Days of Future Past - New Trailer + Clip
Here's a new trailer and an action packed clip from X-Men: Days of Future Past.