The Radeon 3.10 DRM updates weren't interesting when it comes to performance with no big changes, but the update does bring RadeonSI tiling and most importantly is the Radeon UVD support. With the Linux 3.10 kernel DRM subsystem pull, the only major changes are Fermi VRAM compression support and NVF0 mode-setting support. There still isn't any re-clocking support by default or other major advancements for the Nouveau driver in Linux 3.10.
Benchmarks in this article happened from an Ubuntu 13.04 system with Mesa 9.1.1 and benchmarks occurred on GeForce 9800GT and GeForce GT 220 graphics cards. All of the system hardware/software details in full -- and all of the benchmark results -- can be found on OpenBenchmarking.org via 1305085-UT-LINUX310E32.
For better or worse, from these benchmarks and the rest of the results, for at least the two NVIDIA GeForce test GPUs used there doesn't appear to be any movement in either direction for the OpenGL frame-rate of this reverse-engineered NVIDIA driver on the Linux 3.10 kernel.