However, the plot thickens. For those who are on the prawl, they may already got an idea that this is just the early installment. Because this is a "trilogy", the first installment, the current released is entitled: Wings of Liberty focusing on Terran race. And first expansion is called Heart of the Swarm, putting the Zerg race in perspective and the final one is Legacy of the Void, which as you may have already guessed, Protoss part of the trilogy.
With more than 1.5 million copies sold in its first 48 hours, Blizzard Entertainment's sci-fi sequel is the bestselling PC game of 2010 and the fastest-selling strategy game of all timeSource:Blizzard