In either way, it will be open source and quite fun to build stuff on top.
- fancy HDR rendering with reflection planes,atmospheric effects, tone mapping, camera effects, all kinds of animations for doors opening, lights turning on off etc
- content pipelines to get all this data from digital creation tools into packages deployable on target
When everything is said and done this is the same bread and butter what game engines use so the industry has pushed to leverage those and spread to these markers. Both unity and epic have tried with but not without issues.