may patents yung interactive icons/applets, physics and touch responsiveness na hiwahiwalay. might take ages to incorporate them all into one OS.
What you are seeing here is a User Interface. it sits at top of the Operating System so I think this will not take *that* long before a full, working prototype will be available. Just like how Microsoft created Windows 95 just to give their MS-DOS Operating System a "face".
Oh, and Google owns that software.