Thanks to Echoes of Nonsense for bringing this to my attention!
There's bugger all on the official site so far, other than the worlds shortest pure text teaser and the following news
"INTRODUCING ULTRAMARINES – A WARHAMMER 40,000 MOVIE!
The moment fans have been waiting for is finally here... for the first time, the Warhammer 40,000 universe will be realised in a feature-length movie on DVD.
Ultramarines is a 70-minute sci-fi thriller that will use CGI and state-of-the-art animation production techniques. Games Workshop is delighted to be working with UK-based production company Codex Pictures, who have the momentous task of bringing the Warhammer 40,000 universe to the screen"
Also mentioned on Ardy's blog is news of Planetside 2! I played a fair bit of the original, so that's one I'll be keeping a close eye on.