I've only really scratched the first few combat encounters but it really seems like they made it super hard, even on the normal difficulty. I haven't noticed anything mechanically different but there are just TONS of enemies coming your way now. Like, probably a lot more than seem necessary! I noticed in one of the fights that I took out most of the bigger enemies but grunts and imps kept spawning for a few minutes afterward anyway - seems weirdly balanced in that way?
Looking forward to trying more of it, though!