I've been waiting to see the airports and... Wow!! Not disappointed!
One thing I do hope they've thought about that wasn't really mentioned in the video is giving users/developers more control over airport and ai behavior.
For example, an interface that allows you to specify active runway(s) according to wind speed and direction, one way taxi links, multiple ground frequencies, etc. Control that will help do away with all of the afcad hacks like the inactive crosswind runways that are needed to have non-parallel runways active, or plumbing to get pull-thru parking spots to work for ai.
More control over landings and takeoffs would be good too -
being able to set aircraft sizes for start positions so smaller aircraft could takeoff from intersections
being able to specify where aircraft on approach receive landing clearance so that user and ai aircraft can be cleared to takeoff or cross runways even if an aircraft is on final
being able to specify takeoff clearance points so that you don't have to wait until the hold short line to receive takeoff clearance if there are no other aircraft around
having named hold points on taxiways so taxiing aircraft stop at certain points rather than 1 km back from where their path crosses another plane's or the runway....
One way runways so aircraft don't pull 180's right after landing to get to the nearest exit, or taxiways that are weight/wingspan dependent.
Just some ideas so that we can get the realism of the plane's movements as realistic as the graphics in this video.