Over the years, at least from 2015 the NMA seemed set to be a small wide body, 2-3-2 cross section.
A wider single aisle could benefit from a big more comfort medium term , specially with 1,5 aisle width, so passengers can pass each other / trolleys during flight and deboarding.
I never saw Airbus or Boeing proposing this however.
The Russians have a wider MS21, The biggest version -400 will be longer than the A321.
