That is an awesome progress indeed, but I tend to agree with what sebbbi says, those numbers seem quite exaggerated...
Regarding workflow, modeling and level editing basically does not change. And performance wise, even with very optimized bvh trees, updating the world is still quite expensive -- when we talk about polygon-based worlds -- which is the main reason we don't see much, if any, polygon-based real-time ray-traced worlds with lots of moving objects.
I am also a bit skeptical, although I do respect the progress. But those worlds, if they render at 60fps 1080p with path-tracing, they probably render at 300fps with rasterization and still have breath for many moving objects. =)
Please don't get me wrong: I am all for path-tracing, of course! And it's a great achievement anyway!