Very strong press release from Sony in Mirrorless world 3 new cameras anounced ! 42 Mpx Full Frame A7 R II - fraction of technologies in it 399 focus points and Sensor Stabilization, Backlit Full Frame Image Sensor, internal 4K
Te other two cameras: 20.2 Mpx, x10 Zoom RX10 II and the 20.2 Mpx RX100 IV - both very fast (960 fps @480 p, 480 fps @ 1080p) in their class and internal 4K
source: http://www.sonyalpharumors.com/ While this camera is not a megapixel king it's quite full with features and innovaiton. Sensor is quite an achievement, and it should deliver a visible improvement. It combines both Back illuminated (1) and gappless On Chip Lens (2). (1) Light gathering is not obstructed by schematics - more sensitive
(2) The space between pixel lenses is reduced and provides better optical paths - less noise