I followed a similar path to you (OS 8 was where I joined Apple), and I am also intrigued by some of the ideas presented here (split keyboard for thumbs, good job!). I am a little disappointed that I didn't see any examples of touch interaction on what are traditionally desktop applications though. It's all well and good to champion how tiles improve a weather application, but how will they improve Photoshop or Visual Studio?

The premise of an HTML5 and JS based desktop is simultaneously promising and terrifying due to bad memories of the Active Desktop days (and the exploits that brought...).