Centerline thumps, depending if nose wheel actually riding on centerlights
Roll sounds
Ldg gear turbulence
Touchdown
Panel shake
Brake fans
Surfaces:
Turbulence depending on flap position
Smart wind sound
Engine cowling wind sound
Spoilers
Engines CFM/IAE
Volumes reworked to most realistic, measured by prof. hardware in real aircraft.
Cold section air bite at low thrust
Bleed air rush
More clean sounds
Compressor/Fan sounds depend on how much air passes through them. Meaning that at high speeds you will only hear bassy compressor and no fan (real life)
Those are only key items, a lot of other suff reworked, too many to list.