I haven't read most of the thread but I did see a looper mentioned. To me this is a no-brainer next step for Elektron.
The looper should be attractive to both guitarists and mono synth players. Thus, I am envisioning a mono product to keep the price down, though of course if it was capable of handling stereo material that would be a bonus for many.
I'd like to see the loop able to be treated with "effects" while the dry signal running through the box (picture Analog Drive sized, floor-friendly for guitarists) can either bypass the effects or also run though them.
The "effects" -- 2 of the best overdrive circuits from the Analog Heat; an envelope follower; an analog filter; some digital effects (bit reduction; reverse, perhaps reverb). Two inputs for expression pedals that can be assigned to control any of the above. Most people might just use one but it's worth adding a second pedal for those who want to really use the looper as an instrument.
Perhaps farfetched, but I'd like to see a sequencer of sorts that could pick up the tempo from the live playing, then divide it into 16 beats, then assign parameter locks to each step; similarly, the ability to record expression pedal activity for 16 beats then repeat it after the player ceases use of the expression pedal.
The craziest version would have sixteen guitar pedal style footswitches, each of which could be held down while the other foot used the expression pedal to set parameter locks (live) for that slice of the loop. Tapping a single time on one of the 16 pedals would mute that slice. (Maybe instead of dividing the beats into 16 even time steps it indeed could slice the recorded audio using the technology of the envelope follower?) No, I'm not smoking weed, just letting the mind run wild: a looper as a live instrument, as never implemented before.