Except that they are retiring "real" cloud storage like iDisk and only allowing documents... going in the exact opposite direction of Google which moved from only allowing Google Office documents to allowing real cloud storage of all types of files.
It's a weird direction they are going... by getting rid of iDisk they are doing the exact opposite of Google, dropbox, and everyone else.
I think their overall strategy is to move away from the filesystem model since the iPad doesn't expose it to you at all for simplicity, etc. Retiring a service like this makes sense if you keep that in mind.
Doesn't make me want to use it, but that's not the only reason