Those are pretty much the screens that were in PSM. Personally, I'm both excited by and worried about this variable difficulty thingy...I don't want the game to get easier when I get the spoons beat out of me for the 20th time in a row, but I wouldn't mind it getting harder when my enemies become too weak.
I think the idea of Dante in a city is a fantastic idea! I mean you can't do the "big castle" routine too many times, this isn't Castlevania (boy, if it was though!!) What better place to be than in a city that's just as big, if not bigger, than the castle from DMC1. I still haven't beaten that game by the way.