I pulled up the translation of the patent to English from the Japanese patent site. As usual, the Translation is poor, and difficult to read.
Its also written by one of those guys who, when asked what time it is, starts back with the big bang and tells of the formation of the galaxy, the movement of stars and planets, he can't just say how it works, but includes all the formulas for contrast detection, there is so much extraneous data that the real information is hard to find.
It does sound like they have all the bases covered, and understand the limitations of contrast detection.
BTW, it appears that while contrast detection on some models is unreliable, the 6D and subsequent models have been quite accurate and consistent. It makes me assume that they have improved the accuracy or discovered a flaw in the older method. If that's the case though, why haven't we seen a firmware update?
The patent does appear to all be in firmware, no physical changes to a camera, so it could be done on existent bodies, but will likely appear on new bodies first. The timing of the patent release makes it possible that we will see it on a 7D MK II and whatever new FF bodies appear.