I'm going to just say I got rekt hard in two cut video sequences. The AI mysteriously swarms around you and you get surrounded and with the new movement system you can't simply run circles around them any more, so combat and entering a POI is harder, the AI is better and you had better be on your toes. Manage your stamina too. It all needs much balancing, but I see this as "its going to be totally awesome, living in fear again" and there will be no safe place on horde night. The old cheesy rooftop exploit or digging underground will not save you.
BTW, I didn't get rekt because its too hard, but because I made mistakes. The levels are set up in a way to organically surround you if you aren't aware of your surroundings. I think footsteps are broken too so that added to me getting rekt.