While I can't comment on the original thread I can speak to the fleet replacement. From all the information I have heard it is heading towards the 320. Either way they will be ordering 30ish aircraft as the current 320s will not make it till 2025 which at this stage looks like the most realistic time for a narrow body replacement.
Whichever they do get I know it will be a domestic spec. No IFE, no business class, no winglets (if NG) and probably not ETOPS maintained.