I've gotta admit, the Jolla folks do seem to have squeezed just about the most you can get out of gestures on such a small device, particularly by emphasizing moves onto or off of the screen (thus creating a "virtual" space larger than the phone itself). But I would imagine that, given the greater screen space of a tablet, they'd be able to come up with a far richer collection of gesture controls. (At the very least, I'd expect them to be less constrained than Apple and Google, who are locked into tablet UIs that have to maintain compatibility with their existing phone UIs...)