I played the stress test, and I can honestly say that I think people who claim WoW has anything new is talking out their asses.
Having said that, I absolutely LOVED it! I thought MMORPGs were dead for me, having played them all, and EQ for several years.
WoW just does everything so much BETTER than everyone else, I would think it impossible not to like it! It seems to fit just about every playstyle there is. You want to powerlevel and grind? Go ahead. You want to solo? Go ahead. You want to group? Go ahead. You want to log on for a short while and not have to sit and wait for a group for an hour? No problemo! This is one of the few games you can actually log on for a short amount of time and get something useful done. When you kill something, it's probably for one of the 30 quests you have in your quest log, so you never feel like you are wasting time, or that it's slow and boring.
I also liked the new group trend I seem to notice - You don't necessarily group with the same people for hours on end until one of you leave and the whole group is worthless without the cleric, or what have you - no, you group for certain quests and meet a whole lot more people. Maybe you want to take on a group that's a couple levels above you, and you group up with a few others for the duration of the quest. Then sometimes you decide the group was worthwhile and you figure out what other common quests you have.
Ok, enough ranting
I dunno, WoW just really re-ignited my MMORPG flame - I can't wait!