D-U-A-L AF... some sort of stereo solution for depth detection?
D-U-A-L AF, phase and contrast at the same time?
I haven't an informed guess, frankly.
On some unrelated level, I was reading about the camera-designs of the Kinect II and the original the other day, and was surprised that the dual cameras of the first-gen are to be replaced by a single camera in the new version. By comparison, SONY's next EyeToy is rumored to move to a twin camera design. Outside of the videogame industry, TrackingPoint uses a proprietary stereoscopic approach for their new optics system.
I think this is a rambling way of saying that I'm seeing a wider application of dual-optic design in different consumer products, and cameras are overdue for similar methods.
I don't know how a stereo design can be applied to a single lens DSLR--IF that is the Big Reveal--but the general concept of "twin-something" is intriguing to me.