Korg M3 feature wish list:
16 pads with knobs like radias to have a fully featured step sequencer
with note length, note pitch, note velocity, note shift, controler...
should also have some adjustable random functions like random note
length or note pitch or note velocity or note shift between 30 and 50
percent...
or let us do note settings via sysex controller (set note, del note,
note length, note pitch, note velocity, note shift) for use with a
external controler box.

(modified with a photo editor)
exb effect board with 16 seperate effects
step modulator like radias
hdd recording
midi delay effect
timestretch to play short single samples over the whole keyboard without shortening the sample
more lfo´s and envelopes
option to use 2 samples per program and blend them with a envelope or lfo
more filter types, comb filter...
2 filters
option to sample external synths automaticly note by note (like samplerobot)
32 midi channels
second midi out
2 x 8 channel adat in and out
bigger touchscreen