These statements imply a bit more than just Microsoft taking the opportunity to shoe-horn Windows 10 onto the Pi. Together they suggest a close cooperation between Microsoft and the RPF on this issue:-
With the Windows for IoT developer program we're bringing our leading development tools, services and ecosystem to the Raspberry Pi community!
For the last six months we’ve been working closely with Microsoft to bring the forthcoming Windows 10 to Raspberry Pi 2. Microsoft will have much more to share over the coming months. The Raspberry Pi 2-compatible version of Windows 10 will be available free of charge to makers.
Visit WindowsOnDevices.com today to join the Windows Developer Program for IoT and receive updates as they become available.
On the face of it, there is little at the moment to suggest that Microsoft see Windows 10 on Pi2 as a desktop solution, particularly as they would be pretty much forced to supply it for free. On the other hand, Pi2 would be a good basis for any company to cheaply trial a Linux desktop and if enough do that, maybe Microsoft would go further.
The question for me is: what's in it for the RPF apart from the inevitable rise in sales of the Pi 2? They've done a marvellous job of bringing a cheap educational computing ecosystem to the masses, and it is pretty much all based on Linux. As long as they keep focused on that then maybe there's nothing to worry about.
We'll see, I guess.