Even if it isn't, my concern is with how it is implemented.
To be more specific; I think it would be rather lame if the following is how it is implemented:
"Oh, patch day tomorrow" (regardless if tomorrow is indeed tomorrow or next tuesday)
"Oh hey, new Azeroth."
I really think a quest or two to at least explain why Magni is dead, there are claw marks on Stormwind, the park being ravaged, and the world in general being changed is needed, at least initially to help bridge the old world over into the new world.