For those interested, NVIDIA have now updated their special Vulkan beta drivers with 415.18.02 so they're a little less behind.
They have now added support for the Turing GPU architecture, which includes the RTX 2080 Ti, RTX 2080 and the RTX 2070.
They also noted this release has bug fixes for VK_EXT_transform_feedback, the newer Vulkan extension that was made to primarily help projects like DXVK. This extension is still not supported in their regular drivers, hopefully them rebasing this on their latest driver series is progress towards that.
It's worth noting, some users have seen issues with this newer driver breaking Unity games in Wine. So if you're using Steam Play or DXVK with Wine directly, you may want to hold off or do some extra research before using it. Not just this beta driver, the whole 415 series from NVIDIA seems to be suffering issues.
Personally, I noticed Rocket League performing a lot worse with 415.18 as well.