It looks like since May 6th... http://www.blackmagicuser.net/index.php?/user/1-blackmagicuser/#.UBdr0zF4ltY If you're into the camera, Jarred Land also recently created BMCUser.com
Don't get me wrong I'm all for more forums but by all accounts don't think that it has any official ties with Blackmagic. It clearly states its a third party, even though it heavily borrows the Blackmagic logos and banners. So if your looking for a site to have support or feature requests looked at its just as likely to be here as there as another place. Personally I think it's a bit cheeky.
Spent an hour there. It's REDUser.net for the BMCC Complete with rabid, foaming at the mouth fanbois. "Begun, the camera wars have."
