StarCraft 2: Heart Of The Swarm expansion is not coming soon. In fact, it will not be coming out this year at all according to Mike Morhaime, president and co-founder of Blizzard Entertainment. He further stated that we could expect the new expansion to come out in the first half of 2013. On top of that he also mentioned the Heart Of The Swarm expansion will bring along with it a lot of changes to the game as an esport.
Moreover, Blizzard also confirmed that Diablo 3 will get an expansion too. However, there has been no firm date given for its release yet. Morhaime explained that the quality and gameplay of both these expansions would be the top priority for Blizzard.
In another related bit of news Diablo 3 has managed to sell 10 million copies just months after its release.