I was just chatting with my colleagues here at WoW Insider about Blizzard's apparent neglect of their old content (since the expansion zones actually start at 68, Netherstorm and Shadowmoon are basically useless once Wrath comes around), and now here's another sign that Blizzard wants out with the old and in with the new. We had rumored this a while ago, but now it's been confirmed by the CMs: Old school Naxxramas is going to disappear forever when the dungeon moves up north to become a raid in Wrath of the Lich King.
Which means if you want to see Naxx in its 40 man version, do it now -- I believe, as I said way back when we first heard about this, that this is the first time Blizzard has removed major content from the game completely (though it's certainly not the first time they've removed something, poor Captain Placeholder). This, of course, also leaves up in the air what's going to happen to all the items around Naxx -- what about Atiesh? Not to mention lore -- we hear that the fact that a group of players beat KT and took his phylactery and returned it to the Argent Dawn is mentioned in the expansion already -- but how did that happen if the dungeon won't be there any more?
Blizzard will probably clean it all up, and I'm sure that out of game, it'll make enough sense. But it's a shame to officially hear that 40 man Naxxaramas as we know it, the jewel of patch 1.11, will soon be gone forever.