Some stuff sounds cool, but it's basically more of the same with some cool twists (like worgen)
The game will still be the same though, probably as easy as the current expansion (so too easy) as Bz looks content to leave it in its current state.
In it's current form, I don't think I'll be pulled back to it, since it left 5-man dungeoning completely irrelevant, and this was what I always loved best.
Apart from that, most of the Blizzard creatives have already been moved over to their secret next-gen MMO, leaving the lesser minds on WoW to mind the store until the last paying wow-customer has been bled dry.
In wotlk, the levelling experience was great, but they'll shorten that in the next expansion (only 5 levels this time), there's no new classes, they won't add a new continent (except possibly the maelstrom, but I don't expect that to be as huge as Northrend, so basically it'll be a few new contents and more endgame. The wow expansions seem to be more and more low-budget to me, actually.
Oh, and then there's the fact they're planning to bring dwarf shaman and mages in. Humbug.