Not sure what the point is really, but I decided to spend a few minutes on a very quick mock-up. My suggestions/requests for a MKII would be something along the lines of this (apologies for the lacklustre photoshopping), with perhaps some more buttons for direct access to pages and less shift etc need, but we can leave additions for now, since we’re only in hypothetical dreamland and I spent very little time on this in photoshop.
Generally speaking I’m pretty happy with what’s already there, just not the locations of buttons etc, I find it pretty unergonomic and when sitting at the desk in front of it I can’t even read any of the text on the top row buttons, for example. The machine makes me feel like I’m doing the little fish big fish cardboard box dance the whole time lol. So for me, easier one handed functionality and having all the editing stuff a bit more ergonomically laid out would REALLY make me a happy boy haha.
The third volume knob in the pic would be the input gain.
The data wheel is off the MPC2k (sorry lol) and i would LOVE to see one similar or identical to that on the 2400. It’s THE best data wheel I’ve ever used tbh. However positioning is more important then what type it is really. Move that data wheel to where it’s actually comfortable to use and my hands aren’t covering the screen when I’m using it, especially when left handed, and I’m happy tbh.
Other than the re-arrangement of buttons etc, I’d love to see the following in a MKII should it ever happen.
-That lovely looking cream case they showed off recently with wood sides, and ideally grey knobs and faders.
-SSD slot (perhaps with a choice of 1 or 2tb pre-installed.)
-Upgraded ram.
-Master outs still usable when all individual outs are in use.
-All add-on boards preinstalled (perhaps, depending on price, this could be optional too)
-A cover over the screen, so I don’t have to cut my own and tape it to it (with non residue leaving gear tape of course heh).
-The screen at a slightly increased angle. MAYBE a pop up one that’s easily replaceable would be pretty sweet. If it can be done in a way it doesn’t break easily.
I have some more requests, but at this point, not sure what the point of mentioning any of it is, since I’ve not even heard a suggestion of a MKII yet.
All of this being said, I need to see actual step sequencing implemented (which I have been BEGGING for at every opportunity lol) before I’d be willing to bag another one though. 
EDIT: Uploaded wrong pic lol