Sam
EZY A319's have been planned to come to NCL for sometime now, so this isn't new news. (6 this summer)
New routes this year is EZY Malta. However other carriers already fly there. TCX are picking up some of the lost XL routes and BMI are here for a few month I believe.
Routes being withdrawn: EZY PRG + KRK, FR SNN. There could be more (I just can't remember, ask Skyman or HH6702).
No,
Jet 2 have no plans to go transatlantic from NCL.
I would be supprised if we get anymore new routes / airlines in NCL this year.
Hope this answers your questions. Welcome to PPRuNe.