With a 39MP equivalent resolution, the dp Quattro has a setting which can produce Super-High size JPEG images of 7680 x 5120 pixels.
Of all the specs they've released, I think this is the most interesting.
I doubt they have a moving sensor or they'd be advertising IBIS, the best speculation I can come up with is that they have the three layers of pixels offset in order to effectively divide their pixels further. Otherwise they'd have to be just using software interpolation, which probably wouldn't be very good at all.