I've been watching a demo playthrough of it and so far it looks way harder than the first game. Way more enemies (10, I think), way more pressure (both strategic and just plain old time-based), way harder to micromanage, etc.
I've also seen a few very interesting playable easter eggs(??) sprinkled here and there at seemingly random times in the game. And where does Chica's beak always decide to run off to? So many mysteries..