heres my experience. toys r us gave all their discs away to peoeple that ordered once the campaign officially started, i had mine early, and didnt get a disk.... i sold that pre order to my friend.
software etc said they discontinued the disk except for online, but im getting the game from them (giftcertificate).
wal mart keeps getting shipments in, and they are only ten bux, so if u get shafted buy the game at wal mart, and toss the receit , and if your lucky you can have 2 preorder disks, and take the other, and stick it is a drawer some place =)
so id say if u want to, or can afford it shop around and find if they have the actual disk, if not, im sure u wont care once u have the WW game to play.