Apple includes DRM video support in iTunes 5
Just a rumor at this point, but picked up at http://www.betanews.com/ and their feed is usually reliable.
Here's an excerpt of what beta news has to say:
Bloggers have discovered an image resource within iTunes 5 that suggests Apple has future plans for a video store. Three buttons with the terms "Gift Video," "Buy Video," and "Add Video" were found along with references to a "protected MPEG-4 video file" within text strings in the code of iTunes 5.
I'm not going to speculate on fairplay for MPEG4 AVC just yet.