That’s like saying the next version of the PlayStation will be a car instead of a game console. Lightmass is a static lighting tool, RTGI is not static lighting, nor a replacement or upgrade of static lighting, it’s completely unrelated tech. I’m sure the UE4 dev team is working on RTGI too, and they’re supposedly working on a path tracer that would share code with the static lighting tool, so I can see where the confusion comes from, but the two are very different things.