Ghost of a Flea put up an incredible animated short called Rosa.
ROSA from Jesús Orellana on Vimeo.
It's a stand alone feature but is reminiscent of some of the outstanding animation that is being done for video games.
My all-time favorite game opening (so far) is from Onimusha 3. The opening sequence was directed by Hong Kong action-movie director and fight choreographer Donnie Yen.