Here are some StarCraft 2 videos and screenshots released by Blizzard:
Screenshots - http://media.pc.ign.com/media/850/850126/imgs_1.html
Video 1 - http://www.youtube.com/watch?v=iJB-Z54R61s
Video 2 - http://www.youtube.com/watch?v=aJDFw4TGWmo
Cinematic Trailer & Gameplay video available at http://www.starcraft2.com/