A lot of people are skeptical about the the new Microsoft Flight Simulator's performance but I'm confident it's going to be the easiest to run flight simulator yet. Microsoft is releasing this Flight Simulator for PC and Xbox. If they want to get the game running at an acceptable frame-rate and resolution on an Xbox One (Not particularly powerful hardware), they're probably doing some serious optimizations to achieve that. Optimizations for the Xbox One version will reflect on the performance on the PC version.
The most important thing is that Microsoft keeps the in-depth features of their previous Flight Simulators like FSX and FS2004. Given that this game is coming out for an Xbox, where the input method is a simple gamepad controller, they're probably going to make the game "noob-friendly" for the Xbox version, which I don't mind as long as a more in-depth version of the game exists in parallel to the "noob-friendly" version.
That's my 2 cents. The trailer looks great and hopefully the final game will reflect that.