It goes without question that the graphics will be improved so I won't even bring that point up. The following two items are glaring omissions that should be addressed.
First, I would like to see fully functioning aircraft tugs that attach push out and detach from the plane you are flying and others in the airport. Also, airport traffic like baggage, cartering, fuel, security and safty vehicles in traffic and parked. There maybe be some addons that will help, but it should be part of the product who's tagline is "As real as it gets".
Secondly, more realistic weather effects on the runway and in the air. Snow,ice and water affect landing runs and that should be accounted for including splashing instead of smoke. Variable up/down drafts and unexcepted turbulence should be modeled in flight and on final approach. It is too predictable the way it is currently modeled.
A close third is much better ATC.
Thanks for your time reading this post.