When Byrthor asks whether folks attuned for the old Naxx will be attuned for it when it returns in Wrath, Drysc answers with what will sound like music to most raiders' ears: there is no attunement planned for the new Naxx. Blizzard learned their lesson in Burning Crusade about wacky attunements, and so while they're likely not gone from the game completely, there will probably be fewer barriers to raiding, especially early on in progression.
There is something else about this thread that irks me a bit, however. In the past day, the CMs have been hit with tons of questions about Wrath of the Lich King, and in almost all cases, the answer has been the same: maybe. Why don't they know what's going on? Because all indications are, guys, that Wrath hasn't even been designed yet. Blizzard hasn't determined if Atiesh will show up, or if flying mounts will work, or if we'll each get our own Arthas windup doll, because the expansion is still way into the planning stages. It's fine to be ready for 2.2, or excited about 2.3, or interested in what we might see in the Sunwell. But if you're excited to find out what's in the next expansion, have a seat and take a deep breath, because it's going to be a long, long time before the CMs can even know anything worth not telling us. Ya dig?
That said, I can't fault players for being excited about upcoming content, no matter how far off it is. But it does make me wonder about Blizzard's focus. They could just as easily had us playing Zul'Aman or even the Sunwell at BlizzCon-- both of those will show up long before Northrend will. With Wrath so far away, why did they push it so hard at BlizzCon? Why didn't they just announce it, and leave the rest of the hype to something we'll actually see before the Beijing Olympics?