Unreal Engine 4.17 doesn’t bring any explicit mentions and the only Vulkan mention is with regard to native sRGB sampling for Android applications. But other work to find with Unreal Engine 4.17 includes a number of physics updates/optimizations, audio streaming is no longer considered experimental, UE4 plug-ins can now declare dependencies on other plug-ins, a new composure compositing plugin, shaders are now supported in plugins and projects.