It will be not like your know Dungeon Finder. It will be more like specific channels where people will write to search party members.
Every dungeon/raid will have separate channel where people will be able to communicate.
In addition, the gripe I have about "channels" is that you lose track of who is wanting to run what. For instance: You go to the bathroom and all the sudden you missed that message that a healer was looking for your dungeon. I think a automated list that is consistently updated of players and what they are looking for makes it easier to track. But yea stay away from the automation of group formation and cross server stuff, kills community.