When you think about it makes alot of sense: FSX costs around $100 which is a drop in the pan compared to the price of other GIS software (which costs tens of thousands per license)
As a visualisation tool its great: The default terrain is pretty good, there are full atmospheric effects including object and terrain shadows, real weather, water reflections etc etc.....most GIS 3d Visualisation software cant do this yet costs hundreds of times more!
Here is a teaser but dont expect this to be released

Please

thats incredible! 

I wish yoiu all the best with your work Timmo.