Naxxramas for everyone
A little more information has been made available regarding Naxxramas and the Wrath of the Lich King, which Blizzard wanted to share it with everyone.
Naxxramas is planned to be somewhat of an entry level raid dungeon in Wrath of the Lich King and not the hardest dungeon in the game, so things will be a little different from what they are now. One difference is that it will float its way back home to Northrend and will therefore no longer be found in the Eastern Kingdoms.
The developers like having content be more available to players and as such no final decisions in regards to attunement have been made, but the developers also like having special quest lines available to help players be more prepared to face raid dungeon content. It should be said that as an early raid dungeon, there isn't a big reason to block a lot of people from accessing it.
For full details visit Blizzards forum here.