any timeframe for the added function of casading the n12/n8 ?
No, not yet and I believe they will be more of a parallel connection, than cascading.
would one monitor/master section take over? if so ... user selectable?
If I understand this question the answer is very basic.
Since the monitors are simply a function of output selection, you can just select whatever
output you want from the DAW.
Right now, we'll be focusing on getting the single units out.