I believe it's only for Spring.
At a time when Jet2 have flights available right up to winter 17/18, and at a time when people are thinking about their summer 17 holiday, eJ only have flights for Spring
PMI based aircraft only seems to do one LGW flight so it looks like there's more flights to be added. PMI has no new routes and would seem to operate current routes only cheaper. They've not added any new routes following Air Berlin's pullout.
Unless they're being staggered. There were no NCLPMI flights when I checked this morning. Now they're showing.