Most people in this thread don't own the game so i'm not sure if you should take their words for it.
So far in 0.79 there are 2 new characters, roughly 100+ new sex scenes, 60 new outfit sets and 60 (not sure about this one, I haven't collected them all) costume pieces.
Some environment interactions like masturbation, glory hole and machine fuck.
iirc there will be a new character coming and the game will be upgraded into UE5 next month.
EDIT: Oh forgot that there's a new map and small things like framerate improvements and pole dance.
I hate to break it to you but the UE5 update will not be anytime soon, much like the previous "upgrade" where there was zero content for 18 months and the game development stalled even more than normal.
It's just the usual scammer cycle, the day before did the exact same thing. Stall for time with an "upgrade" that takes time, milk supporters and repeat.
I supported the game years a go and still have access to harem and would 100% say it is not worth the money right now. Even the demo has better textures, better frame rates, higher fidelity and other than some outfits (that mainly clip into the bodies and furniture) there's not much more in the current version.
I logged in last week to see if it had improved, most "new" poses are ones that were removed and most of the new character poses are just copy pasted off other girls, erotes really doesn't add anything to the game as it's still just an animation viewer, log in, have a difficult wank, log out. The demo is the best version of the game in all honesty.