Hopping on to the test server today I was able to snag pictures of the new instance Naxxramas which will be coming out in Patch 1.11. You can see all the pictures here.
In order to get into Naxxramas right now you need to speak with Johnny McWeaksauce, he is in front of Lights Hope Chapel. Here you can get attuned by him for Naxxramas or just request to enter the instance.
Heading in we are greeted by a siamese cat named Mr. Bigglesworth. Pressing further on into the spiders, we wiped almost instantly. Those spiders have a mean poison effect. If you can keep the mages up, AOE them. Even with the new mage changes and the fact that everyone had epic armor, we still had a hard time taking down these creatures.
Of course we really didn't get to far in, since this is a new instance and this group was a pick up group, but we did get to the first boss, Anub' Rekham. This is one big mean fat fly. Beware when fighting it, there are scarabs that come out and attack you, which makes the fight even more difficult.
The Archmage Tarsis Kir-Moldir was also sitting inside near the entrance, but as of yet he didn't have any quests.
Looking around it looks like an instance that will be a great deal of fun, even if it is fighting more bugs! 

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