According to the interview with Julien Venturini and Jean Jaсques Khelil(microsoft regional representatives):
1.FSX will be released in november-december in two versions-Standard and Deluxe.Deluxe will cost about
80 euro.
2.SDK will be available along with Deluxe edition.
3.FSX will no longer require any module like FSUIPC-it has
its own module for that purpose.
4.Gmax will be included in FSX Deluxe edition package.
5.2-meters mesh resolution will be supported
6.Flight dynamics files(.air and aircraft.cfg) will be upgraded considerably-much more parameters are available for editing
7.SLI-technology and multicore processors are supported.
8.Weather system will be improved.Features,wich are available now only with addons like ActiveSky will be supported by default.Tornados and wind shift.
Nothing said about ATC and multiplayer improvements...