Some kind of in-game server list showing all hosted games is a minimum, no? With filters for game version, campaign/module (it's not going to be just the official campaign after all), difficulty, level range and current progress within the campaign. If Persistent Worlds arise then a server type setting would be nice as well for those who're looking for action/role-playing/mixes specifically.
But I don't really see PWs being made if it's only up to 6 players. Sure, if the limit was at least doubled or tripled then PWs and thus a real need for dedicated servers would likely appear.
And then a Game/Dungeon Master mode/client, heh.