Microsoft seems to be focused on Metro as the way forward. I don't think it's that much of a stretch that they might be pushing JavaScript to the fore-front of their development strategy while starting to side-line C#. I could draw parallels to Apple's sidelining of the Carbon API in favor of their Cocoa API. IIRC, Photoshop is still using the Carbon, even though the majority of development now is in Cocoa.

Granted, I don't follow the Microsoft development community closely, so there may be something that I'm missing out on, but I don't see it to be as 'out there' as claiming vast conspiracy theories surrounding historical events.