Apparently five used IAE V2500 powered aircraft will be dry leased to replace the dwindling 737-300 fleet, only four of which are now left flying, original plan for five 737-800 from an unnamed source and two 777-200ER from Egypt Air, was changed to eight 738s which was also shelved despite having been approved, three more 320s will come in later.
PIA engineering are against this deal due to engine choice and were favouring the 737, rumored that the airlines former CEO/MD resigned due to this as well, he wanted Boeings too.
Twice in the past PK attempted to get the Airbus, in 2007 brand new on lease and in 2010 from Freebird Airlines.
Interestingly Kingfisher aircraft might be the ones they are going for, in the case of 738 they were looking at Jet Airways.
[Edited 2012-12-23 07:09:39]