I think they said they were going to work on it and it would be implemented later. "Content like PoTD & Diadem will be updated into the Party Finder sometime later. It won’t be available at launch of the new PF for cross-server play." That was from a translation of the 3.5 live letter part 1.

The raids used to be like this (You would go to the NPC to get in) but now they are queueable so I don't think it's out of the question.