Constant refinement and organisation of all the engines features/workflows. I like how vray eventually organised its menus into default/advanced/expert. I think as programs get older and add more features they ignore what a first time users impression might be.
VR specific AA?? and anything to do with VR performance
HDR display support
Anything vulkan/webgl2
Making apex cloth/destruction objects inside the engine
Unified physics system like flex
Support for 3dconnexion spacemouse/navigator… Plus inside vr editor??
https://forums.unrealengine.com/showthread.php?380-Support-for-Space-Navigator-3D-Mouse/page5 I found this but havn’t received my spacemouse yet to try it.
Alembic support
Anything to do with physics based animation
Anything to get good lightmaps faster
Anything to make implementing AI easier
Ray traced reverb/positional audio
Text to voice synthesis/phonetic mouth rig
Geometry 2.0 (similar to sketchup) + VR Editor = VR modelling/UV seams??
Full feature UV editor
UDIM support