HoloLens is a headset that allows interaction with a computer without a physical screen. Instead, the headset "projects" the screen into your visual field, like a hologram only the person using it can see.
On the Windows 10 front, Microsoft has promised to deliver its newest OS free as an upgrade first to Windows 8.1 users, followed by Windows 7 users. The option would be available for one year after Windows 10's release.
Windows 10 features a redesigned start button, taking away the much-hated start screen in Windows 8.
|Windows 10 redesigned start button|