XMLHack.com has a little more information on what will be included as far as XML capability in MS Office 11. It sounds very good, but what does the end user care? If everyone is using Office, does it matter to the end-user that he can now use arbitrary XML schemas in his documents?
The current (or previous) versions of Office did what people needed. Is this newest release, wherein Microsoft embraces interoperability, a way to make the current version obsolete?