It's assumed that this is a Windows Phone 8-running device, judging by the presence of the Family Room live tile, which is most encouraging. If we take an even closer look at the photo, we'll notice a bottle of water in the background with the word "Pure". Now, we're usually not the ones who'd get too absorbed in thoughts of such conspiracy stuff, but hey, when there's also a Lumia in the picture, the logical thing to come to mind is that it may have some sort of PureView technology!
As we said, nothing is known about this model yet, but it does seem to have a relatively large screen, although we can't be super-sure just by looking at this pic.
What do you think this could be?