Worth mentioning, the "used game fees" thing is highly disputed right now. There are different people within Microsoft and within official channels who are saying different things.
That's the biggest fail from the announcement. Microsoft mentioned a number of things that are guaranteed to provoke gamers, like used game fees and always-on DRM, then refused to clarify any of them. Some reporters present got flat refusals to answer questions while others were given different answers depending on who they talked to.
Do you have any links to anyone clearly disputing it? Because I haven't seen any. The closest I've seen is a guy saying, effectively, "Of course we wouldn't do that! Unless it's a used game. We don't want to talk about that case yet."
From what I can tell buying a physical disk gives you an activation key that you apply to your console. Any profile on your console can play that game. If you bring the disk to another console and use your profile, you can also play the game. If you try to use the game on another console and profile, you either have to buy another copy or transfer the license from your profile to theirs.