You have probably already seen the Twilight Archon from brainwasher5's thred. Many, myself included, probably thought it was formed from a high templar combined with a dark templar. But, it is my belief that High templar and dark templar are BOTH gone from the game. Instead, they have been replaced with a 'Twilight Templar'. If you look at the end of the video with the archons, you can see two small gray-colored protoss sitting back behind the fight. One of them even casts psionic storm (which looks beautiful, by the way). But the resolution is poor on this video. So I downloaded the Artwork trailer and, behold, there are the templar! They appear in the scene where the mass of zerglings floods into the Protoss base. They are just levitating near the Nexus. They appear to have the body structure of a High Templar, yet they are grey in color and have the silvery look of a dark unit. And, when a zergling gets close enough, the unit attacks with what looks to be a psi blast. Perhaps these new templar are a combination of the old two, of sorts. Perhaps the new Twilight Archon is a combination of the Archon and the Dark Archon, with both of their abilities or some entirely new ones.