The surprise news at Microsoft's GameStock, according to this story on Gamecenter, is that Relic Entertainment, well-known as the creators of the space-themed RTS game Homeworld, will be partnering with Microsoft on their next project. Apparently the game is unique, or at least enough so as to scare Sierra away from it (they had right of first refusal on Relic's next title). Nothing is known about the game beyond what little Relic CEO Alex Garden was willing to say: that it's, "a game even more ambitious than Homeworld."