I faked a 5 row stretch of the A321 with the Indian double bogey, PW1000 GTF engines and stretched wing/sharklets.
Could be a 757, 762, A330, A310/TU154 replacement.
Fly Airways A322 NEO Fake Aviation Design - Modified Airliner Photos
It seems Airbus has its engineering resources stretched however, so little chance.
Airbus engineers review A320 upgrade plan | Reuters