I'd be shocked if they aren't already inundated with more signups than they can count. I can't wait for the "it doesn't work with open source drivers" bug reports to start hitting their lists. It'll be about then when they realize why porting anything commercial to Linux is a colossal pain in the ass. The zealots are always keen to ruin it for everyone.
I'll just wait for the regular release, which in Valve time could be anytime between tomorrow and several years from now.