A reddit thread posted just over 8 hours ago tells the story of a user who has purchased a Nokia Lumia 920 from eBay only to discover they are in possession of a device that seems to have once belonged to a Microsoft engineer.

Said user has posted several screenshots from the device which appear to show off a brand new calendar design, the ability to organise apps by frequency of use, and perhaps most interestingly: a notification center.

Whilst we can’t be 100% certain of this information, the quantity of screenshots that have been provided, as well as the presence of what appear to be internal apps still in development definitely lends some credibility to this rumour, in fact we're going to go ahead and give this a 7 on the rum-o-meter. Check below for a few of the screenshots and a list of the revealed features so far, or head over to flickr to see the originals yourself.