Boeing Boy,
Current fleet plan shows 2 x 763 being flown for Nordic this winter (with 3 TOM pilots going with them) and only one aircraft will return to the UK. The 4 x 757s are being replaced by a mix of new and your old 738s (i think) over the next year. They are to be retrofitted with blended winglets and an updated FMC before being transferred to Nordic.
I'm not sure if they will replace some of your 737s or be additions to your fleet.
Information from a recent trip with a Mngmt Pilot.