EDIT : in the branches of their revision server there's a Vulkan branch - so no I don't see any modern OpenGL code but it looks like they're not idle on the technology front.
However I hope the developers have been engaged in some hardcore work behind the scenes - Vulkan is hardly a drop in replacement for OpenGL - you really need to know what you're doing and going from an immediate mode GL design to a low level Vulkan design without extensive experience in the upper echelons of OpenGL could become quite the nightmare for them - Vulkan is very unforgiving of errors and it doesn't hold your hand.
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