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Basically there are two major changes: firstly, a bunch of new additions to the "hidden content" (if you don't know what I'm talking about:
After the completion of Stone/Glass Door DON'T ask Lith what's wrong. Then watch him break down in tears and leave you alone in the Void. Then just wait. You'll have to do A LOT of waiting.) and secondly, if your PC is a female/cuntboy, you can now summon a Dildo in order to give Lith the D without actually having it between your legs.
There's also a few little changes in the first half of the game that help newcomers "read the room" better. It's not much, but I think it's a step in the right direction. Now there would be less confused players that randomly push all the buttons until, say, a Dominant Lith path is unlocked.
And yes, the Steel Door content AKA the endgame STILL ends on a cliffhanger. Goddamnit Lithier, I just want that catboy to have a happy ending (and some wholesome lovemaking) he deserves, all the sideline dicking can wait.
But then again, the sideline dicking in the "hidden content" is great and I do recommend it. Also the next update is confirmed to be a main story update. So its probably the last waiting game.
Edit: Oh, and 2 new pieces of art ofc.