my M5 thoughts:
I can happily live with the loss of a transistor ladder in order to gain two 12 db multimode filters.
I was not sure if there will be a midi interface integrated on the M5, however if there will be one I would like to see the kind of floating/rotating voice assignment that's also present on the Korg monopoly, PAIA 9700, Roland MPU-101, and Vermona Perfourmer. For the type of synth that now arises from the recent description, this makes polyphonic voicings feasible and will make the M5 more versatile for my own purposes.
If not, I would prefer no midi interface at all, since I will rather drive CV/Gates directly from a sequencer.
Regarding the SEM filters, I hope for an insertion loop in the resonance circuit of one filter if possible, so that resonance can be colored or delayed.
For me personally, 6 EG's would be too much, Three (freely assignable) EG's would suffice for me.
Talking' EG's: if one EG could have a VC decay that would be heaven.
Inverse ADSR outputs would also be nice.
btw: I love AD/RS envelopes, so I hope they will not be replaced with ADSR's
If LFO's are not midi syncable, a reset input would be cool (so they can act as EG's after all). One LFO with a 0/5 V range (rather than -5/+5) for VCO modulation would be useful for me.
Another thumbs-up for me would be a kind of buffered distributor module that takes one CV in and distrubutes it to three outputs, each having a potmeter for attentuation. Great for multiple LFO assignments.
.....
Now I am starting to dream also;
A VC mixer with 2-3 inputs ? If not, maybe one extra VCA for delaying lfo CV's etc ?
and how about one or two (!) analog delay modules (BBD's) with a CV in for delay time
Ok, I will stop now, I guess am getting carried away too far here.
I am really anxious about normalized VCO/VCF/VCA connections and the 1/4" connectors in the M5. It will save so much confusion.
hope this helps a little