Valve are needing people to work on Mesa to prepare it for OpenVR, and they will be paying for the effort of course.
Those interested can see this tweet for confirmation:
We're looking to contract experienced Mesa contributors to help us get the open-source AMD stack OpenVR-ready. Please help spread the word!— Pierre-Loup Griffais (@Plagman2) October 13, 2016
This is really great to see, Valve paying for improvements to open source drivers. This will of course involve Vulkan, since Valve already confirmed VR on Linux will use Vulkan as opposed to OpenGL.
Pierre-Loup didn't say where to get in touch, but their Twitter would be a good start, you can also find general Valve contact emails here.
SteamDevDays continues tonight (UTC evening time), so I will keep an eye out for anything interesting again.