I've been hearing about Microchip's plans to have a new line of PIC32s with an M14K core some years ago, and it could be probably PIC32MZ, as I've seen in the datasheet's future product list.http://ww1.microchip.com/downloads/en/DeviceDoc/61145L.pdf, page 11-12.
It is probably a new M14K core, and compared to the M4K ones we have on the SKPIC32 (PIC32MX795F512), this one contains more features.