I've toured the preliminary discussion re FSX. The promo sounds promising, but will M$ upgrade the following basics?
True volumetric clouds, including realistic stratus;
Realistic simulation of flight within Cb cloud;
Logical sequencing of arriving AI and user aircraft;
Improved ATC, such as holds on VOR radials, & realistic vectoring;
Eliminating the (illegal) ability of AI aircraft to overtake and/or kill you when you're on a precision final;
Realistic ATC accents. No more American accents at Dubai, Tokyo or Moscow;
Realistic world landclass, to replace the boring and inaccurate scenery tiles;
Eliminating the sim's failure to RAM-dump, which corrupts weather themes with data from the preceding theme;
Eliminating the programming that causes cloud layers to climb with your aircraft, regardless of your flight level;
Accurate ATIS, eliminating the often ridiculous announcements of 'Clear skies' when thunderstorms cover the airport;
Realistic sound effects for heavies on take-off. Instead of the dramatic roar, I hear something like a cheap air conditioner;
Attending the many causes of sim crash, due to conflicts within the sim.
Doubtless, there are more basics that don't readily come to mind, yet have been mentioned in previous posts. Hopefully, the M$ team has heeded suggestions from the sim community, and attended the basics before becoming obsessed with whiz bang visuals. We have many serious simmers out here, including many real-world pilots, and I'm convinced they prefer greater sim realism to 'gamer' attractions.