According to a post by Cinder over on the Midway Boards, Xbox owners are going to have to have a little more patience with the last Mortal Kombat game on their console. In addition to being passed over on a Premium Edition of Mortal Kombat: Armageddon, the Xbox version of Armageddon will ship out one week after the PlayStation 2 versions. Since the PlayStation 2 versions will be in stores on October 10th, the Xbox version will be in stores on October 17th.
UPDATE: The previously mentioned thread was deleted. A new thread restating the delay was created.