As far as this new year goes, who knows what will happen. The Blood Angels get their second wave, the Grey Knights are going to get an update, the Inquisition will attempt to use the Tyranids as a tool (again) and they'll get a second wave around August time-frame (the Nids, that is), and we'll hear some news about the Sisters. If we're lucky, they'll get an update at the end of the year, but I suspect it'll be more of a 2012 thing. If nothing else, the rumor-engine will start up for them. I guess the Necrons will get some love too, but they're not my thing.
Farewell, 2010; we knew ye far too short a time.