Yeah, once things get out of sync, unlike with the 737's there isn't a spare 757 so it can have a pretty bad effect!
Well the word within the company for summer 2010 it will be 21 733's (same as now once ET has gone back to the lessor) 6 757's (G-LSAA/B/C/D/E/J) and 2 B767's. The word is that AG/AI will be the first to go to fedex later followed by AH. Of course as this is Jet2.com, more than likely we will end up with a nice nackered B747-100 for the Scallicante runs and replace the 733's with 727's as they were picked up for a tenner from the desert.. and a 707 chucked in to keep the fleet age up! Jokes aside if these B767's do come lets hope they have more than just a few years left in them unlike a few of the high cycle ex Chinese 757s!
I'm not sure on the economics of these apparent 767's but for example, Jet2 carried 370 pax LBA-PMI today on a 757 & 737, stick them all on a 767, is there a substantial cost saving?!