As far as I know, three new stands capable of handling Code E aircraft - 777 / A350 will be constructed at the western end of the south east pier. Initially they will be remote stands but when the terminal extension is built , they will likely become contact stands with air bridges. I did see it mentioned that one of these stands could handle aircraft up to A380 size but dont know if that is still the case.
Existing stands 4 and 12 are having works done to accommodate aircraft up to 77W/A350 size.
I believe some of the substandard taxiways are also being strengthened to accommodate larger aircraft and improve operational flexibility.
I stand corrected if anyone has better info?
With regards new routes, there was a rumour of Air China this or next year but no idea how true that is. We may also see 787s from Norwegian for longer routes to the likes of Orlando etc once the 737Max routes are up and running.