Leading up to this though, Red Hat attributed Nouveau not entering the mainline tree sooner on the basis of some microcode/firmware concerns. Without sorting out the issue for this mysterious microcode, known as ctx_voodoo, they could not sign off on the code. As of right now, they haven't even fully resolved this situation but they are just having ctx_voodoo be loaded through the kernel's firmware loader interface. However, we have learned that ctx_voodoo is not even needed for all graphics cards and that Red Hat was just attempting to ignore this little fact.
This NVIDIA microcode is not even needed if you are using a NVIDIA TNT, GeForce 1, GeForce 2, GeForce 3, GeForce 4, or GeForce 5 series graphics cards. Only if you are using a GeForce 6 graphics card or later is ctx_voodoo even needed. Albeit, these voodoo-free graphics cards are older, but there's still likely many Linux users running them. In fact, those are the ones that in fact would likely be interested in Nouveau to a greater extent considering those GPUs are only supported by NVIDIA's legacy Linux drivers (and some of them are no longer even supported at all). NVIDIA's binary legacy drivers are very rarely updated and when legacy driver updates do come down they often just contain new X Server and Linux kernel compatibility fixes.
Theoretically we could have already had a Nouveau DRM driver in the Linux kernel without any of the ctx_voodoo support and it would have worked just fine with the TNT and GeForce 1/2/3/4/5 graphics cards.
Out of curiosity, if you plan to use the Nouveau driver coming up in the relative near future, respond to this thread and let us know what kind of NVIDIA graphics hardware you are running (i.e. GeForce FX 5200, GeForce 9800GTX, GeForce GT 220, Quadro FX1700, etc).