As a starting point, here is the talk on Vulkan at GDC 2015
I still have not had a chance to watch all of it, but among some interesting notes toward the end were that the "Hello World" for Vulkan is 600 lines compared to 5 in OpenGL.
Also some links:
Official page: https://www.khronos.org/vulkan/
LunarG debug tools, GLAVE: http://lunarg.com/vulkan/