Blizzard supremo Mike Morhaime is more cautious in the promise. They're "on track to launch" this year but they won't release "until it's ready."
Kotick maybe the CEO of Activision Blizzard, but Morhaime is CEO of Blizzard and we all know how really wears the trousers in that family - money speaks. "Although an exact release date has not yet been announced, we are on track to launch the expansion by the end of the year," said Morhaime. Blizzard is fanatical about 'done when it's done'.
"As with all Blizzard games though, we won't release until it's ready." Blizzard has spoken. It took 7 years for StarCraft II to finally get out the door - they take their time.