For me only problem will be that raidgroup I am meber of wants to do only 25 mans (well management does) while I would prefer 10 mans. I don't mind doing 25s, but I got the impression that management considers doing 10 mans as 'cheating' (seeing all the fights before rest of the raid).... meh, we'll see what happens, still lots of time before 80

.
Naxx will be different from old, purely cause noone can bring 5 tanks in a 10 man, and it is pretty hard to get them in 25 also. Boss horseman quit from Scourge and is now organising raids against Naxx, so they are down to 3 anyway

.