Microsoft revealed in January that devices running Windows RT, including the company's own Surface RT tablets, won't get an update to Windows 10. At the time, the software maker said it was "working on an update for Surface, which will have some of the functionality of Windows 10." That update will now arrive in September, according to Microsoft's Gabe Aul. Dubbed "Windows 8.1 RT Update 3," it's not really clear what new functionality the update will bring. We reached out to Microsoft, but a spokesperson simply revealed the company will have "more to share soon."