Rumors have been flowing all year that Microsoft has been working on an Amazon Echo-like device that would be powered by its digital assistant, Cortana. Some even claimed that this device might show up at the company's Surface event last month. As it turns out, it doesn't seem to be a device at all, according to a tweet from Microsoft tipster WalkingCat.
HomeHub is meant to be a family-centric feature, which will allow users to access certain parts of the OS without having to log in. These would include things like music, lists, calendar, and more. The name is apt, as it would be a sort of hub for everyone in the home, rather than just allowing for personal accounts that are targeted at individual usage.
So instead of it being hardware, it's a feature of the software. Since it's coming to Windows 10 for PCs and we've heard about HomeHub for some time, it sounds like it might show up in the Creators Update, which is slated for release in early 2017.