Putting myself in their shoes
I would fear the AR to cannibalize the MD sales, as the A4 with the MM. I would take away some functionnalities for a period of time as a test range to see what happens with legacy gears.
Then I would decide what’s next for the MD & MM : Retire or Refresh the digital line? I already have plans for these (and billions of posts on boards if I had no idea…).
Therefore I would have no interest in advertising midi control or anything else in my sleeve that is implemented in the MD & MM.
I have 2-3 machines in R&D, Overbridge, software/VST, OS updates, more and more clients busting my balls over the net, I am pretty stacked for quite some time! And then, I have billions of posts on boards if I had no idea what to do next…
My modo : less is more.
I am Elektron and this is my design.

My favourite artists use
- TR-606/808/909, TB-303, SH-101, MS-20, MPC’s, Moog, and so on… Very specific and specialised tools.
Having 3 SFF boxes like AR-A4-OT that offers :
- 8 analog synth drum + samples
- 4 analog synth
- 8 samples tracks + 8 midi tracks
or 2 SFF boxes like MD-MM :
- 16 tracks of multi VA drum synth + samples + midi control
- 6 tracks of multi VA synth + user waves + midi control
I feel spoiled… even if they are not “ultimate”. How many are willing to take a single purpose TR for the price of a multi purpose Elektron?
Concerning Digital vs Analog I tend to see the matter as Digital painting vs Oil painting. Different tools, with different feeling and textures… One can get close to oil painting with Photoshop, but really I think we should take tools for what it is and their strong points, exploring possibilities of the medium and their limits.
To summup
I think we will get midi control and more sonic possibilities as HQ tends to be secretive (see overbridge or +drive on A4) on both analog machines, in time… Both AR and MD are drum machines but with different sound sources/medium (altough AR is sale as drum computer, what does it mean if it means anything?).
I have the MD and never fully used the 16 tracks for drum purpose, at least 4 tracks are used for controlling. Never used it alone, always Layering with drums from OT (or MPC or MM). 8 analog voices will be enough for my needs, adding samples on top of that (with overdrive and compressor) is the cherry on the cake.
I am quite intrigued by the FM/Ring mod bass drums. What does it say about the AR’s futur?..
This is my plan :
Sorry MD, I always loved oil painting… 
PS : Like shoes, one can never have “too many drum machines”!
Cheers