One of MSDN's most recent blogs goes into detail about Microsoft's efforts to vastly improve wireless connectivity in Windows 8 to the point of even providing native connectivity support for 3G and 4G networking.
As it stands now, specialized applications from hardware providers are required for mobile connectivity. The idea of Windows 8 being able to handle everything on its own (including built-in data activation and usage tools) would make for much more simplified and seamless connectivity.
I can see many other positives of going this route as well, one of which would make Windows 8 intelligent enough to automatically disable the mobile connection when a recognized WiFi network is within range.
Check out the video below for a demonstration on how it's all coming along.
Kitguru says: Yet another sign to suggest Microsoft's best OS ever is on the horizon?