Intel's Larrabee will launch as a workstation / professional chip intially, as Intel knows that these drivers are less complicated and that you can get a lot of money in this market.
With half a dozen 3Dlabs people who had the hardware and the drivers before, it should not be that hard to make the right OpenGL drivers and enter the workstation market.
Intel knows that this is a real cash cow and that it can earn some nice money out of it. Intel also realizes that it needs time to make the right gaming drivers. Larrabee will be a top to bottom thing, but it will take them time.
Workstation stuff comes by the middle of 2008.