The sign-up page reads, "What’s Vulkan all about? Learn more about this upcoming new graphics and compute API directly from Khronos, the people who have been creating it. In this 1-hour session, we will talk about the API, and also go into details about the Vulkan SDK from LunarG, and much more. We’ll of course end with a Q&A session, and a recording of the session will be available here."
The Khronos Group and LunarG will be leading this webinar on 18 February. There is no comment on the public release yet of the Vulkan specification.
If you are a premium member, see this thread for beginning to share your ideal Vulkan test requests, etc.