Kind of an obscure talk, but if you find #3D lighting and/or Overwatch interesting, you might enjoy this talk. The debugging tools were neat to see.

They started work on overhauling the global illumination before Overwatch 2 even launched in 2023. In late 2024, they started shipping the new lighting system.
https://youtube.com/watch?v=0PlxPCq-DbQ#gamedev