I think art assets will be either backward compatible or very easy to migrate (just like it is now).
However code assets or blueprints, you may forget about that.
I hope for two things.
- modularity of whole engine. For eg. if i make small mobile game, i do not need VR, physics, probably no niagara, maybe even no umg (i could replace this with my own menu plugin if very basic funcionality is exposed somewhere). All to make mobile game smaller. Currently even empty project is around 100mb.
- and Vulcan as fully supported render option.
Or. in short more love for small mobile games.