We know that Source 2 from Valve is a pretty capable game engine, and we've seen what they've been able to do with it over the years (and Half-Life: Alyx turned it up a notch) but what's next? Ray Tracing perhaps.
Read the full article here: https://www.gamingonlinux.com/2021/01/valves-source-2-shows-early-teasers-of-ray-tracing-weirdly-in-artifact-updates