Jet2 have uploaded their preliminary schedule for W20/21 here are some of the changes, subject to change:
ˇTenerife South goes up 1x weekly from 4x to 5x weekly
ˇGran Canaria goes up 1x weekly from 2x to 3x weekly
ˇLanzarote has an extra weekly flight during peak times
ˇAntalya becomes year round 1x weekly
Still not available for booking:
Geneva, Vienna, Salzburg and Budapest
I would think maybe Budapest may be uploaded later but we shall see as Wizzair and Ryanair are competitive on this route.