Impatiently waiting for the update!
The correct answer should be ‘soon’.
As per the update from Chris, "within Q1" - so that should mean by the end of March…
Simon_NI wrote in his post from February 19th, that Custom Chord sets would be comming in a few days:
As you may have read from Chris, we have some updates coming to Maschine. Following the release of Maschine v3 software last year, we’ll bring Custom Chord sets – another highly requested feature to Maschine 3 in the next few days after a successful beta-testing period.
I suspect maybe they will release it in the same timing as Scaler 3.