I like the idea of this app a lot, but I wish people wouldn't announce iOS apps before they're available in the App Store. I just searched for it and couldn't find it. Chances are I'll forget about it in an hour and never end up buying it.
I'm not sure how I feel about these new "UI-less" UIs... This app is cool, but it seems like I might forget how to perform the necessary idiosyncratic gestures if I don't use it for a few days.