Mesa 17.0.4 has some new Polaris 10 PCI IDs, R600 has improvements to out-of-memory cases, and there are a wide variety of other fixes throughout.
More details on the changes of Mesa 17.0.4 can be found via Mesa-dev.
This morning Emil also branched Mesa 17.1, a few days later than planned. Mesa 17.1 Release Candidate 1 is now available. Weekly release candidates of Mesa 17.1 are expected until officially releasing it around mid-May. More Mesa 17.1 benchmarks are coming up on Phoronix.