If you're on Playstation, it'll probably be 33.something Gigs, cuz that seems to be a funky thing PS does to some people. If you're not, or it works normally, then it'll most likely be 5 or less. I think the last enhancement (non full expansion) update was about 2.5G or so, but my memory is awful, so it's hard to tell. As the other poster stated, the only way to know for sure is to wait until tomorrow to see what kind of update we get and how big it'll be.