Good news for developers, as SDL [Official Site] 2.0.6 now has support for Vulkan firmly locked into place for the next release.
SDL 2.0.6 will have Vulkan support! You can make a Vulkan-compatible window and let SDL handle the platform-specific pieces of your setup. https://t.co/IJ6BrIndA5— Ryan C. Gordon (@icculus) August 29, 2017
You can see the actual commit here. With the actual work behind this being done by Jacob Lifshay and Mark Callow.
Since this is the first initial support of Vulkan in SDL, it may still have some rough edges to be worked out as new implementations always do. The games and applications using it need to support Vulkan themselves of course, since SDL isn't going to make an OpenGL app suddenly use Vulkan. I hope this might help Vulkan adoption more in future though, since it's one less hurdle for developers to jump over.