One thing that looks like a negative to me is that the distance from the keyboard to the often-used FILL and VARIATION buttons, looks to be much greater than on KN-6x00. I often press FILLs and VARIATION changes with my left hand while playing chords. It looks like this has gone from a 1" reach to maybe 5-6" (from ~2cm to maybe 12-13cm). I can program my footswitch to do FILLS, but I like to change Variations fairly often too.

I think overall the "reach" to get from playing the keybord to the controls, quickly while playing to make a change in sound or rhythm, will be noticably greater than it is on the KN-6000 and earlier keyboards.