There doesn't seem to be a 'feature request' section for hardware, sorry if this is the wrong section.
Can I be upfront and say that I was very disappointed to find there still isn't any aftertouch on the MiniLab, even in MkII version, especially as various reviews say it uses what is essentially a shortened version of the KeyStep's keybed, which does have aftertouch.
Even disregarding non-Arturia VSTs, so many of the V Collection and Analog Lab presets only come alive with aftertouch. People who buy the MiniLab get the Analog Lab as part of the bundle yet their keyboard doesn't allow them to hear its potential.
To get me a portable-sized USB controller with aftertouch I've had to drop 100GBP on a KeyStep, which is full of features I'll never use (such as the legacy ports, arp and sequencer) and omits many features I would have liked, such as the MiniLab's rotary controllers and pads.
Missed opportunity IMO.