The "1.0/0.9" Book is really the "Dojo 1.x" Book, and will be updated to reflect that over time (it's a big book, and there is no magic "up the version number everywhere" button. I've looked ;) )
New features are being added to the Book pages now, the 1.1 release notes cover all the specifics of transition, and and the new API tool covers everything Dojo: http://api.dojotoolkit.org/
The "1.0/0.9" Book is really
The "1.0/0.9" Book is really the "Dojo 1.x" Book, and will be updated to reflect that over time (it's a big book, and there is no magic "up the version number everywhere" button. I've looked ;) )
New features are being added to the Book pages now, the 1.1 release notes cover all the specifics of transition, and and the new API tool covers everything Dojo: http://api.dojotoolkit.org/
Hope this helps.