Micha RTX will bring little performance improvement to VR as the pure ray traversal in VR is not the bottleneck.
Internally, we also use a super high quality reference path tracer. But these reference path tracers lack any tricks and hacks (hence reference) and therefore they are a few hundred times (at least) slower than Enscape. Does not make sense to release it. But we intend to move at least the Ultra configuration very close to the visual quality that the reference provides.