Probably going to be the area where you fight Tchar'zanek and his four champions. Did you have a city lockout on that character when you had it copied over?
I don't think that's what it is. The 4 sub-bosses aren't going to be in the new city redesign. I have to think it's something else.
In one of the blogger interviews they said that the king instance (as it is on live) might come back in some form or another.I won't be surprised if thats the new name for it.