A thicker phone would be great. All these manufacturers forgot at some point we actually need to hold these things with a human hand.
Having said that my fp4 is actually a pretty good thickness. They just screwed that up by rounding the the edge so much seemingly to reduce contact grip.
If the 10hz reading implementation is good I may consider upgrading my fp4. A better camera would be nice too but if they get the power saving if that screen right then I'm interested...
Otherwise my fp4 has everything thing I need a phone to be