UltraPixel @ 12MP wouldn't be a bad shout though. Bigger pixel size is the direction a lot of manufacturers are going towards; Apple already moved to a larger pixel size, so did both the Nexus 5x & 6P and the S7 is rumoured to have too.
Are the sensors on the 5x and 6P considered larger pixels? I thought it was 21MP, which still seems awfully high.
I really just want one phone manufacturer to make the Sony A7 of camera phones. That has a full frame sensor at "only" 12MP, and yet the low light capabilities are almost magical. You can be in a literally pitch dark room, and you can crank the ISO up to still see things as if there was a light source in the room. Give me a slightly thicker phone with a larger physical sensor and around an 8-10MP camera and I'd be very happy. An Android successor to the Nokia 808 or 1020, but replacing the "high megapixel lossless zoom" with low light capabilities would be ideal.
I really thought the Z5 would be the one to step it up seeing as their camera and sensor business absolutely killed it in 2015, but even the Samsung phones beat the Z5 in low light.
As for the M10, this sounds disappointing already. I'm tired of my M8 now. Camera sucks, plain and simple.