Microsoft is set to show the world in January the features that will be included in Windows 10, but a leaked video today provides a good deal of information about the new OS.

Immediately noticeable is the inclusion of Cortana (Microsoft’s answer to Siri) as a major part of the user interface, a lot of cosmetic improvements, and various makeovers for the apps. The Cortana search bar (with microphone icon) is open by default at the bottom left of the home screen in the new build. All your Windows Phone settings are synced to the desktop OS, meaning that you can see your mobile news, weather, and places in the Cortana pop-up menu.

Some minor and cosmetic aspects of the command bar have been changed, and in general the user interface looks more complete and polished than the one we saw in the last video leak of the new OS, which showed up December 5th.

Many of the apps like the Getting Started, calculator, sound recorder, and the camera app have been reskinned and updated.  There’s also a Contact Support app that connects users directly with Microsoft support, and the Xbox app gets a cool makeover.

In a related development, one Twitter user seems to have uncovered what appears to be a new Windows Phone app in the Windows Store. The app description says it requires an ARM processor, which raises questions about whether this is really a phone app. But the app description clearly says “phone.”

There’s also some Twitter chatter suggesting that Windows 10 will support hand gestures and 3D stereo headsets.

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