And now it looks like Mark Shuttleworth is heading down the same road. And dragging Ubuntu along with him.
Exactly why I quit Ubuntu

As far as tablet implementation, well . . .
*nix is a command-line oriented OS. Windows/OSX are a bit more GUI oriented. But there is no OS extant in the public arena that is touch oriented. Until that is developed, tablets will be naught but high-tech book carriers and entertainment devices with middlin' communication capabilities.
That's exactly what the Unity interface was supposed to do, dumb down the front-end to some big shiny buttons and slinky menus, so everything is accessible with a touch.
...but I'm afraid you're on the right track; Ubuntu (or any other Linux Distro, for that matter...) is still a
desktop OS, whether command-line or button driven, and the HUD is still firmly in that world, as far as I can see.
Hence Android and iOS; They ARE touch-operated OSs.
Admittedly, they don't do much beyond work the phone and SMS (with the OSK, of course), store your contacts, and play some touch-and-swipe games, while the pads remove the phone part and allow you to view and interact with larger screenfuls of info.
Yes, there is more possible, but what can you do with a touch-oriented interface beyond what it does already?
I agree, content creation beyond tactile art is never going to be practical on a touch interface... until somebody comes up with a programming language, or at the very least an IDE that is PURELY visual.
Imagine writing programs by connecting
Reactable Tangibles that contain program objects instead of sound-generating elements.*
If Mr. Shuttleworth wants to make Ubuntu a pad OS, he's going to have to totally abandon the whole desktop gestalt (something I thought he was trying to do with Unity).
The HUD is so keyboard-centric, it makes me think he actually figured all this out, but I'm doubting...
* After doing some research, it is apparent these kinds of things have been around for a while:
http://en.wikipedia....ory#Visual_languagesAll the elements needed for touch-interface programming to be practical are there, but it's going to take the insane audacity of someone like Steve Jobs to make any of these into something slick and shiny and promoted
ad nauseum to catch on.