The next instance we are in line for might be Wailing Caverns. I say 'might' because I don't know how up to date the web page I found the list on is. Top of the page says Updated: 18 Dec 2004, and I bet there has not been any changes since then. I think they are a bit too busy trying keep up with the population problem, and are not all busy creating new content. So yeah, it's gunna be this one.
The page with the list also has some fine info on instancing, some things we didn't know, that would have been nice to know. A good idea to read it: http://www.worldofwar.net/guides/instances.php
Wailing Caverns, 15-21, The Barrens, Horde
What should we level to? I think try it as we are now. Level 17 most of us. Just right. Or wait another level because we are short a person?
Anyone know anything about this? Where do the quests come from etc?