Mists of Pandaria - The next WoW Expansion?
The Post - The Thread - The Official Thread
The Trademark Document

Release at 2012 Q2?
Blizzard Product Slate "Leak" - WoW Brazil Confirmed

Question 1: Pantas? Really? (yea ok I know we have zero info about it for now, but still...)
Question 2: Too soon?

1) I fucking hope not! I'd hate to see the panda shit to become anything more than sonething joke related.
2) Depending on when they are releasing Deathwing it may be cuttinh it a little bit close - I'm hoping for another raid before Deathwing at least.

I'm 83286846283% sure that Deathwing will be at the next patch 4.3 (and last for Cata).
The only other option I can see is to have 4.3 and then, sort after in 4.4, we will get Deathwing alone (no trash strait to the boss instance).