Microsoft is busy preparing the release of its “Windows Technical Preview,” but thanks to leaked screenshots and videos we’re getting an early look at some of the features the company is working on. Alongside virtual desktops, a new Start menu, and a Notification Center, Microsoft is also bringing its Cortana digital assistant to what will likely become Windows 9. German site WinFuture has published a series of screenshots showing a very early version of Cortana in the Windows Technical Preview. …