Blizzard are taking an interesting route in deciding which model to use for one of the units in StarCraft 2 - letting the community vote on it:
The protoss dark templar has always been one of the StarCraft community's favorite units -- now, the community has a chance to participate directly in the dark templar design process for StarCraft II! Over the course of the next month, players will vote to decide which dark templar model will appear in StarCraft II multiplayer matches.
There are two alternative designs you can vote for, or you can select for them both to be in the game and they'll spawn randomly. Head over to starcraft2.com
to vote for your preference!