Windows 8 also has a nice API for it so that apps are aware of it and can prompt for big downloads or disable automatic syncing.

http://msdn.microsoft.com/en-us/library/windows/apps/hh75031...

I think it makes sense that Apple is not very interested in making new features for OS X. They make only a tiny fraction of their profits from it and Mac sales have been down close to 20% from last year. To use Jobs' post-PC analogy, Why invest in making better trucks if you think the world is moving towards cars?

Meanwhile, Windows is Microsoft's bread and butter.