I love it!!! If it has the same notification system as Harmattan too.. Oh that would be a dream come true...

Also, it would be awesome to borrow the same top bar (where the clock, signal status.. Etc) concept from Ubuntu Mobile.. (with only a long press), a short press would trigger the same drop down menu from Harmattan.

Also the main menu's icons are not so great, but that's easy to change.. But it brings up a question to my head, in ur concept, does allow for an easy theme change? Or is it like Sailfish with their "ambiance" change..