A few days ago, an app called Phone Insider was found in the Store. Not too long after, Microsoft's Gabriel Aul even confirmed on Twitter that the app will be discussed at next week's January 21 event in Redmond.

The focus of that event is Windows 10, and many believe how it will work on Windows Phone devices will also be detailed.

Now, a new version of the app – with a different name – has been found in the Store. Dubbed Windows Previewer Beta , the app appears to be an internal test version of the app. Windows Phone app developer and XDA forum moderator Jeremy Sinclair has also managed to pull out a few screenshots and details from the app.

It should be noted that this app cannot be downloaded by the public like Phone Insider as the app is marked private.

According to the app's description: