Just read about it this morning

Sony announces the new A7rII, RX10m2 and RX100m4! | sonyalpharumors (http://www.sonyalpharumors.com/sony-announces-the-new-a7rii-rx10m2-and-rx100m4/)

They look good, but looks like they have entirely NEW sensors, so maybe we won't ever get a 4K FW for the "OLD" versions, even though the old sensor CAN do 4K...

The existing models get such excellent results at HD resolutions, I can wait for a while on the "new" ones, unless I need that CRAZY high speed up to 960 FPS capability!