They didn't with their custom UE 4 branch. You may see sharing with the studios they have recently purchased but I wouldn’t expect them to share the tech with studios making games for Playstation too.If The Coalition makes the UE 5.X version, is it likely that MS will distribute this Xbox specific engine version to the mutiplatform developers?
What low-level coding needs to be done in Lumen to make code much faster on current consoles with good quality?