Excellent news on the surface and, if the trailer is to be believed, unlike Dovetail's borked effort, will have passenger jets from the outset.
Subject to the hardware specs, I will definitely be in the market for this albeit with the caveat I shall keep FSX in reserve.
As an aside, do we know if this is being developed in house or if MS have outsourced. And the other thing is, given MS history with their train sim franchise (two aborted attempts at MSTS 2), I'll believe it when I can actually log on to their store and buy it... :)