Naxxramas is moving to Northrend with the upcoming Wrath of the Lich King expansion. This is good for World of Warcraft loremongers for what better place to have this ancient Nerubian ziggurat than the lands close to its master?

What was first introduced as a 40 man raid might actually be shrunk down into a 25 person dungeon, much like Gruul's lair. In addition to this, the armor models that were in the original Naxxramas may actually be used as a new tier of armor. Here's what Blizzard Poster Bornakk had to say about this instance:

When Naxxramas was first launched it was truly end game content and designed to be the hardest dungeon in the game. You really couldn’t walk in there and succeed unless you had a well prepared group with gear from places like BWL and AQ40.

Our current plan is to make Naxxramas the first 25 person dungeon in Wrath of the Lich King, kind of like Gruul’s Lair is for The Burning Crusade. The encounters will be designed to fit this roll and we believe this will allow a much wider range of people to experience it.

Along with this, the armor models that were used in the original Naxxramas might be reused as a new tier of armor. They were designed to feel like what you would find in this type of dungeon and they really did a great job of it.