You're using ppjn as a source? That same ppjn had jet2 ordering 707's (with garmin gps) at the previous update! It can be edited and updated by anyone with no checking of information.
Yes, spotted the joker that published the B707 order, which was ignored but of course was useful, as it prompted someone perhaps in the know to publish something that is credible, i.e. an order of 6 x B738s for 2016, which doesn’t differ from JET2’s previous history of additions to their fleet, and a plausible solution for replacement of their older B733s with B737-700NGs.
In the main JET2 forum there was also talk of an AirbusNEO order of new airframes on the back of the Norwegian order placed in 2011, some, me included thought it a reasonable proposition but this new ppjn posting sounds much more believable.