Well, as we all know by now (If you've been paying attention.) They plan on making games available to download over the marketplace. The obvious set back to this is the storage space on hard drives. So, rumors have been floating around that they going to make a 1 TB hard drive (1 Terabyte is 1,024 gigabytes.) 1KGB is certainly a lot more than we have now.
While I think it will allow people to download more much easier, I also don't see a point when you can just buy them and play them on the disk. Buying 1TB of space just so you don't need a disk is a little over the top if you ask me.