Not only that but the web site is giving you the chance to pick which version of the Protoss unit Dark Templar will be put into the final game. You can see the two different versions right here. One has more of a costume look while the other exposes more of the alien's form. You can vote for either one or you can vote to have both models in the game (it would be generated randomly when you decide to build one in the game).
Gallery: StarCraft 2 Screenshots