RTX global illumination @ 4K 90 FPS... now that's more like it. Not directly comparable to some of what's been seen already (BF5 etc), but interesting nonetheless.
https://wccftech.com/gaijin-on-nvidia-rtx-vulkan-enlisted/
I'm quite sure as devs get their teeth in to RTX and start to explore its potential, we will see far greater performance and ability to do some nice looking things.
Interesting interview, but these are the important take-aways:
"RTX support is not required for our GI solution, it provides additional functionality/quality, and is available only with Vulkan support." & "As far as I understand, DLSS is not yet available in Vulkan API."
In other words, it's their work with Vulkan which is responsible for all this magic (as we have seen with Doom et al) and this RTX GI = HBAO+ 2.0.
Don't hold your breath on better performance when implemented for other aspects: "Enhancing shadows and, especially, reflections is tempting. However, it will depend on the available performance budget for the game."