Here's a quick look at Cortana on the Xbox One dashboard preview

[Windows Central]

The New Xbox One Experience (NXOE) is available to test for select dashboard preview members, bringing shades of Windows 10 with it.
A keen reddit user recently discovered that you can access Cortana on the NXOE using a hidden menu item. Cortana is currently slated to appear on the Xbox One in early 2016.

If you're still outside the preview, I've put together a video to show how she works on the new dashboard, although I thoroughly expect she'll work a little differently when she ships to testers properly.

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