Blizzard are in a pickle and the only ones who can help them are naturally you - the fan. They want us to vote on which Protoss Dark Templar design/tribe is to be used in Starcraft II.
The first choice is a Dark Templar from the Lenassa tribe, present in the original Starcraft. The second is a Dark Templar from the Zer'atai tribe (who wield dual scythes and wear an ensemble of heavy armor and the bones of slain zerg, wohoo!). The third options is for both to be in the game and that one of the two will randomnly spawn when you build a Dark Templar. Get your voting fingers ready and head over to the official website to weigh in on the popular vote.