Musaffah apartments have been filled up months ago!
With the present utility costs, there are even people with villas trying to find someone in Musaffah to swap with. You won't get a flat there in a hurry.
Three weeks ago, when I last asked, there were three villas available immediately, but no (good) flats.
Anyway, you don't have much choice in where you want to move; it's up to the company, and they'll put you wherever they want. You may be lucky or unlucky.