The whole thing is a big mistake if you ask me.
First of all, the name. Pandaria It has the word Panda in it. We all know what a panda is. It's a unique animal, that only lives in China.
How does this fit into WOW universe? Yeah ok they were a sideshow in WC3, but to make them the them for a whole expansion?
They are basically going to be freaking teddy bears. It's way too cutesy and doesn't fit well within the WOW universe, the more I think about it the more I hate it.
I'd be ok with pandarea being a single zone, and the panda men being an npc faction within that zone (like the tuskarr). But they've named the whole expansion after them.
I can see it now, everything is going to have a Chinese theme, and cute pot belly teddy bears everywhere.
Maybe the 5th expansion will be called the red sands of Australia, with koalas and kangaroos as the new playable races..