There was a topic of discussion on the official forums regarding Dungeon Finder queue times and the lack of tanks. Here is a comment from Game Designer Brian Knox on the issue:
Originally posted by Knoxxer (Source)
The instance matcher queues are cross-server. PvE is all matched up and PvP is all matched up. The issue is tanks not population. We know it sucks and we are working on getting warriors balanced and able to queue to help speed up the times.
We’ve already mentioned that EME wants to balance Warriors for PUG tanking by the end of the summer. However, we do pick up a small detail that, if you haven’t already figured it out, tells us that PVE and PVP servers are in different pools for the dungeon finder. It’s a curious choice from the developers to segregate both segments of players. One would think that they would want to create the largest pool of players possible for their system. Perhaps it has something to do with the upcoming Battlegrounds and separating PVP players and PVE players. What do you think?