I might just play it for the first two or three months just because you know the monk class will be hilariously overpowered for at least that long. Scratching my head a bit on a race that is available to both factions though. It is honestly going to be slightly sketchy in terms of pvp, Being able to tell who is your enemy and who isn't is pretty key and now you suddenly throw in the same race, could be a tiny advantage to be a panda. Hell some people might think twice by seeing a red panda is a big battle because you might be mind controlled or some other silliness.
Also a bit curious on what type of roll the monk will fill, I mean when you think of monks from other games there is the healer version, tank version, and dps...which worries me because the paladin kind of filled this role. If they're throwing in another hybrid that is able to tank/heal/dps and ends up being a melee dps I think I might just back-hand the next blizz employee I see.
All that said, I honestly will just come back to see what it is and drop it right after, I was less and less interested in wrath, cataclysm just showed me they knew how to rehash BC and Wrath fight, my expectations are even lower for this. I want end content, yea it is great to have a bunch of pretty new zones, but once I see them, I've seen them. The thing that is going to hold my, and everyone else's attention will be the end game content, not a bunch of pretty scenery.
Edit: Also is it just me or does the year pass seem a bit desperate on Blizzard's part?
