A trailer for the upcoming Captain America sequel, which looks pretty good. Boost it to 1080p and fullscreen for maximal enjoyousness:
Also, heres the latest clip from the even-sooner-upcoming Thor sequel. (I dont recommend fullscreen for this one; even at 720p the resolution doesnt look that great.)
And heres the trailer for the Doctor Who 50th anniversary; 1080p/fullscreen recommended again. All previous Doctors are glimpsable in the trailer, though some are easier to notice than others.