The full game probably won't be on the card if that's what they do anyway. You'll get a 8-16GB card which will be cheap and let you play the first 3-5 hours of the game, the rest will download to your HDD.
Hell even most disc based games are like this now, the moment you get home you have to download a huge update/patch to play it.
The days of full video games being completely self contained on their physical media are long over.







