its in the FAQ's
I just read the FAQ's from the Flight website and no where does it say its coded from scratch. It's says that they are approaching the virtual flight genre from the ground and are enhancing the scenery and terrain, but no where does it say that it's coded from scratch. I think at this point that's just a guess or assumption.
Here's a copy and paste from it.
Frequently Asked Questions
Q: What is "Microsoft Flight?"
A: "Microsoft Flight" is a new PC game from Microsoft Game Studios. The new title will be available on the Games for Windows – LIVE service and will bring a new perspective to the long-standing "Flight Simulator" franchise. From new game play elements and enhanced scenery and terrain to new aircraft and integrated content marketplace, it is an entirely new breed of virtual flight. The Games for Windows - LIVE platform sets the stage for all your virtual flight needs while connecting you to a global base of users, content and endless exploration. Microsoft Flight builds off its heritage of deep, immersive simulation and is redesigned to make the experience easier for virtual fliers of all interests and skills.
Q: How does “Microsoft Flight” differ from “Flight Simulator?” Why the new name? What’s changed?
A: With “Microsoft Flight” we’re approaching the virtual flight genre from the ground up, with the focus on the universal appeal of the experience of Flight. We believe the simplicity of “Microsoft Flight” perfectly captures that vision while welcoming the millions of existing Flight Simulator fans. The new “Microsoft Flight” retains the full fidelity simulation longtime fans have come to expect while offering all players a whole new look and feel, a wide range of new game play and challenges, persistent experiences and social connectivity.
Q: How does Games for Windows – LIVE factor in?
A: Games for Windows – LIVE introduces a new level of connectivity to virtual flight, enhancing both the social and game play experiences of the title. Content is updated virtually. You can fly solo or join an entire global flight community online. You can easily connect with and facilitate flight experiences with your friends. The addition of Games for Windows - LIVE creates an ubiquitous virtual world of flight that offers easy and engaging access to the magic of flight for all.
Q: Who is developing “Microsoft Flight” now that ACES is gone?
A: “Microsoft Flight” is being developed internally at Microsoft by a team that includes many of the same creative minds that helped deliver countless entries in the “Flight Simulator” franchise.
Q: Why did Microsoft shut down ACES Studio last January?
A: Microsoft Game Studios is always evaluating its business model to determine what is best for both gamers and the company. Many factors were considered in the difficult decision to close ACES Studio, but we feel the 2009 closure helped us better align with our goals and long-term development plans. "Microsoft Flight" is being developed by many of the same creative minds that shaped "Microsoft Flight Simulator," and we're excited about delivering a new take on this classic franchise.