this 128 samples per track thing is actually a veeeeeeeeeeeery powerful feature!
for example, imagine this polyphonic pads issue someone mentioned in this thread. now just sample 10 different chords, e.g. Cmin, Cmin7, Csus, C, Cmaj7, inversions of those chords, whatever and pitch them up and down as needed. just one example. i would rather see the full strength in handling 128 loops with just one track!
this mute group monophony thing is also very useful in my opinion. you still have the option to use several tracks. with polyphonic tracks it would be more difficult to create mute groups than it's now to create polyphony.
the potential of the audio features, slice points timestretch etc, we haven't even touched yet in our discussions. it might be the case that, in the OT, you don't need to properly divide audio material to different tracks like in a DAW, because the audio material can be disassembled easily. so you might mix an audio soup in one track and afterwards pick your hihats etc. out as if it were stored in a clean warehouse.. in the MM this can be done very well already with filters and gating and the OT has been developed on that knowledge base!
and i'm very sure it will be possible to create full tracks with just the OT, because it's already possible with the MD, which is in fact just a drum machine