Definitely new areas but not replacements. The same ones are used so often it's like queuing for the toilet at parties
As a member of a group kind of rediscovering the alternatives to the House, I have to say the excavation site and the forgotten temple are two excellent dungeons.However, I think Lord Zin needs to be nerfed for the temple to be suitable for the high-teen level parties: he's definitely an opponent for epic parties, and they probably wouldn't bother going down there.
A detailed map of every single individual world area joc *Facepalm*