I understood that they were going to try to have their 319s supplied with 156 seats, and were applying for a "waiver" of the 1 CC per 50 seats rule, so that they could still operate with just 3 CC per flight.
WWW & kriskross - even if they don't sell those last 2 seats (or 6) the rule is applied to how many SEATS are in an aircraft, not how many PAX are occupying them.
cheers
FF