From what i've seen in-game after a runthrough:

- All the Tainted Chars have revamped start menu portraits
- T. Jacob and T. Eden have redone boss/floor transition sprites (really like the one for T. Eden)
- Some items have been renamed and given new descriptions, including Cupid's Arrow, Godhead, The Body, Transendance, and a good few more. You can see them all in the item list ingame.
- More items have new sprites, like Gello and 9 Volt, probably more
- Bosses seem unchanged


really hope the mod gets to add a new boss/floor transition sprite for T. Beth before it hits completion but I like the new stuff we got

Honestly, I hope this isn't going to be actual final update. I really like this mod and I just wanna see it being more polished. If I was good at programming or pixel art, I could even help, but alas I am stuck as anyone here.