Something that sadly got buried in my inbox is this video of David Airlie (Red Hat) talking about the Vulkan Graphics API.
If you're up to date with everything Vulkan, this won't give you any new details, but it's still a nice video to watch straight from a Mesa developer.
He does go into detail on why it was made and what the problems with OpenGL are, like multi-threading which on OpenGL isn't great. It's actually one of the reasons a lot of OpenGL ports perform worse than their DirectX counterparts on Windows. This, is what Vulkan should help with.

Thanks for the link 'Nod'.
If you're up to date with everything Vulkan, this won't give you any new details, but it's still a nice video to watch straight from a Mesa developer.
He does go into detail on why it was made and what the problems with OpenGL are, like multi-threading which on OpenGL isn't great. It's actually one of the reasons a lot of OpenGL ports perform worse than their DirectX counterparts on Windows. This, is what Vulkan should help with.

Thanks for the link 'Nod'.
It's interesting how Valve are attempting to push the open-source drivers and provides insight into their long term plan. It makes sense for for Valve to improve the open-source drivers, as they develop games they can debug/extend the drivers as and when they need and not have to wait for the manufacturer.
Dave is funny. Although I think he rubs some in the community the wrong way. Haha. Chuckled a little at his dig at their website.