While StarCraft 2 will feature three races like its predecessor, Blizzard has suggested that a fourth race may appear as part of an expansion pack.

“We don’t have the resources or time to add a fourth race to the launch of StarCraft II, but I’m sure in the event that we decide to do an expansion set it’s a feature that’ll come up for discussion,” said Blizzard co-founder Frank Pearce.

Pearce explained that the team has originally considered adding a fourth race to the game, but chose to focus on the “cool, best ideas on the existing three races rather than diluting those ideas across four races.”

StarCraft 2 is expected to be released sometime next year.