Before getting too excited, these patches are queued up in Mesa Git master which now means Mesa 9.3 (or more likely Mesa 10.0 pending OpenGL 3.2/3.3 compliance) and not Mesa 9.2 that will be released later in the month. Additionally, this Compute/GPGPU support for the Nouveau "NVC0" driver is very rudimentary and not everything you need to get OpenCL running on the reverse-engineered Nouveau driver.
As said by Nouveau's Martin Peres in the forums last month after the initial patches were posted, "the proposed patches are the bare minimum to read the MP counters on nvc0 (which require executing a hard-coded kernel)."
With this compute support committed, now also in Mesa Git master are some MP performance counters for modern NVIDIA GPUs. The work is part of this year's X.Org Google Summer of Code via the student developer Samuel Pitoiset.