Nvidia showed an improved version of their Marbles RTX demo during the RTX 3000 launch event. What makes this new demo so impressive is that it appears to handle dozens of small lights without breaking a sweat, something which is notoriously difficult for a path tracer, let alone one of the real-time kind:
Making of Marbles RTX (really fantastic):
The animation is rendered in real-time in Nvidia's Omniverse, a new collaborative platform which features noise-free real-time path tracing and is already turning heads in the CGI industry. Nvidia now also shared the first sneak peek of Omniverse's capabilities:
... and real-time path traced gameplay:
Siggraph 2020 in-depth overview of Omniverse:
https://developer.nvidia.com/siggraph/2020/video/sigg05
Be sure to watch this one, because I have a feeling it will knock a few people off their rocker when it's released.
UPDATE 6 Oct 2020:
UPDATE Dec 2020:
Nvidia just released the open beta of Omniverse!