For some definition of "supports". The last two or three releases of Ubuntu have used the Nouveau driver by default for the LiveCD, which causes my system to hardlock (known, unresolved issue for almost two years now) so I've had to pass special kernel boot flags to disable it and use the VESA driver instead to install and then switch to the nVidia driver afterwards.
Realistically though, I don't think it's ever going to be practical to use the Nouveau driver. No Cg support, no CUDA support, and performance will always be a fraction of nVidia's driver.
That isn't to say that I don't wish them well, I do. But I still think it's foolhardy at best to ever expect this to be truly competitive with nVidia's proprietary drivers.
Realistically though, I don't think it's ever going to be practical to use the Nouveau driver. No Cg support, no CUDA support, and performance will always be a fraction of nVidia's driver.
That isn't to say that I don't wish them well, I do. But I still think it's foolhardy at best to ever expect this to be truly competitive with nVidia's proprietary drivers.