The presentation really doesn't cover much in the way of new material if you've been reading all of our Vulkan articles on Phoronix since last year. He basically recaps that there is going to be an open-source Intel Vulkan driver, AMD will eventually open-source their Vulkan driver, the Vulkan conformance suite is open-source, and many of the Khronos tools around Vulkan will be open-source.
Jason says users should care about Vulkan because it's a great API to target for applications and drivers, it's easier to integrate within toolkits, it's easier to package and distribute, and may bring more applications/games to open platforms.
Among the challenges it's bringing for open-source developers is how to mix OpenGL and Vulkan support, developers needing to learn Vulkan, and more infrastructure arpimd this new graphics API still has to be built up.
If you're not in Brussels this weekend for FOSDEM 2016, fear not, there are PDF slides currently available for this quick overview of Vulkan.