If I recall correctly, (and this is going back many many months) the mobs were itemized (they dropped the appropriate gear). However the mobs that should have seen through invis didn't.
I also heard that at least some of the mobs did not have any faction associated with them. In other words they did not agro when you went near them and didn't asist each other. not sure how much truth there was to this as I did not go there myself.
Here's one of the old posts regarding the zone that Goobles posted:
http://www.project1999.org/forums/sh...highlight=hole