I guess this was vaguely announced last year, but the official release date is slated around the same time as when the Heart of the Swarm expansion to SC2 ships. http://pc.gamespy.com/pc/starcraft-ii-zerg-heart-of-the-swarm/1188898p1.html
As much as I love Blizzard, I am very sceptical about this. It may be good, it may be great, but for some some reason I just can't seem to gain interest. Perhaps its just because there is so much MOBA stuff already going on with different companies. *shrug*
So many MOBAs. Im sure it will be solid because Blizzard is making it. But will it be too soon after valve releases DOTA 2. Idk well have to see.
By causing both companies to throw a lot of money at lawyers. Lawyers who will fight it out in teams of 5 down the 3 court lanes to see who can blow up the others argument first...