Was dissapointed that virtual shadow maps didn't make it over too :(
Hopefully the groundwork is now there with the port to 5.0 to be able to add these modern features like lumen, nanite and vsm, decals in pt. Just opening up old scenes at the moment and I'm hard pressed to find a difference visually!
Edit: Just did a video render and there is no difference visually between 4.0 and 5.0, except glow has changed and also the stock tree models are slightly different color, gi is a little different too.
I wouldn't understimate the effort it took to move over to 5.0 - so hopefully the visuals come soon.