Looks as if Bourgas is to be Jet2's newest destination, schedules loaded for Summer 2019 from:
MAN - x2 weekly
BHX - x2 weekly
GLA - x1 weekly
EDI - x1 weekly
LBA - x1 weekly
NCL, BFS, EMA are listed but yet to show schedules. STN is not listed
A quick dig through the Jet2 booking engine also suggests that the following will be new routes:
Izmir:
MAN - x2 weekly
BHX, GLA, LBA, NCL - x1 weekly
Chania:
MAN - x2 weekly
BHX, LBA - x1 weekly
Lleida seems to be a new ski route from Stansted for W18/19
Very pleasing in my opinion!