After the open vs. closed GeForce 700 tests this morning, Martin Peres wrote in the forums a brief Nouveau Maxwell update.
There's basic mode-setting and acceleration support for Nouveau DRM that will be merged into the Linux 3.15 kernel. While the basic kernel-side support will be there, the Mesa Gallium3D driver needs much more work. Martin wrote, "the ISA has completely changed and we need to work a lot on the compiler in mesa in order to get it running. Yesterday evening, Ben Skeggs managed to get a triangle. Time will tell how long it will take to have 3D support for Maxwell."