It is not an unknown fact that Cortana for Windows 10 will come alive with a new Build of Windows 10, most probably in January 2015, when Microsoft will talk about the consumer preview version of Windows 10. Though, there are hidden Cortana settings already present in current Tech preview versions of Windows 10.
Now, a new video shows early version of Cortana for Windows 10 in action. It can still do most of chores the Cortana on Windows Phone can do. It can take reminders, call people with Skype, check location, play music and so on. But the UI looks unpolished and it doesn’t answer questions related to its existence and personality.