It seems to me that new features in UE5 could bring significant benefits, both to devs. and players. e.g. real-time global lighting and no more baking! Also automatic LoD! Has there been any discussion on UE5, a quick search revealed nothing.
https://forums.dovetailgames.com/threads/from-the-unreal-5-stream.53562/ I posted here yesterday because I think I probably saw what the OP saw, lots of potential to fix things that are currently issues in TSW (e.g. lighting in tunnels and in general)