So Dire Maul was added in patch 1.3 as well as meeting stones. However meeting stones still don't work and innkeepers doesn't either offer ability to join groups.
Are they gonna enable their functionality soon?
Patch 1.3.0 (07-Mar-2005): Meeting Stones added.
Patch 1.5.0 (2005-06-07): Innkeepers around the world now have a gossip option that lets you join a meeting stone directly from the innkeeper rather than going to the location of the meeting stone. Also these Innkeepers will now have background lore about each of the dungeons.
Patch 2.0.1 (05-Dec-2006): Meeting Stones now function similar to a Warlock Summon spell.