Tigole posted a ton of new information on the official forums last night regarding upcoming dungeons and raids being added to the game with patch 1.11 and the expansion. Look like we will all have a lot to work through!! Keep it coming Blizzard!!!

Just wanted to give everyone a quick update on what the Dungeon and Raid team has been working on lately:

Karazhan

Karazhan is slated to be a max level, 10 person raid instance in the expansion. Its absolutely massive. Its also non-linear although it does become linear at certain points. There are at least a dozen bosses in there so far. Using the raid saving tech, well be able to make a small raid dungeon (only 10 people) where players can save their progress if they cannot do the whole thing in one night. We're trying to implement ways for them to quickly get back to where they were if theyve already made progress in the dungeon. For example, after you kill certain bosses, you can open a door thats a shortcut from the entrance.

Hellfire Citadel

This is the first dungeon players will encounter in the expansion. It lies in Hellfire Peninsula, the zone just beyond the Dark Portal. We're planning on making this a winged dungeon. Right now, two of the wings are scheduled to be lower level level up wings (for players leveling to 70). One of the wings is slated to be a maximum level 5-person dungeon. And lastly, there's Magtheridons Lair, a raid wing similar to Onyxias Lair in size and scope what I like to call a quick raid. Of course, during the development cycle this could all change. Same goes for the Beta. But thats how we're approaching this dungeon currently.

Naxxramas

Naxxramas will come out in Patch 1.11 and will be previewed at E3 in a couple of weeks. This raid dungeon is massive and hosts more bosses than you can wave a stick at. And a really big stick at that. Currently, Naxxramas is in internal testing. After a few more weeks of internal testing, well put it on the PTRs for an extended test period so that you guys have time to hammer the encounters and provide us with feedback. We'll also be doing a lot of tuning during internal testing and during the PTR time. Expect the difficulty of encounters to fluctuate a lot on the PTRs. Expect a lot of info regarding Naxxramas to come out during E3.

Other Dungeon/Raid stuff

We're working on a bug fix thats preventing people NOT on the upgrade quest from seeing the Barons additional loot table in the event that they kill him in under 45 minutes. We're hoping to get this out sooner than 1.11 but it might take a client patch to fix.

Also, Patch 1.11 has some great interface improvements coming. More info on that later.

You can read Tigole's full thread and respond in the official forums here.