Behold! Windows Phone 7. Someone wasn't quite careful enough with his last minute update of this MWC signage and a passerby managed to snap this first glimpse of the WP7 interface, featuring bold, rectangular icons and Xbox integration.

This shot seems to confirm, to some extent, the bit of the last significant batch of rumors that promised tight Xbox integration. It also shows off the simplistic, geometric start page, including big, square icons for phone calls, messages, Twitter, and Facebook and a large band for accessing your pictures.

The device in the shot is a simple one: the screen is surrounded by a black bezel with a thin metal trim. Three hardware (or maybe touch?) buttons below the screen are the only visible controls, with a backwards arrow, a home-button with the Windows icon, and something that looks like a sideways magnifying glass. Is this the Zune phone? Or just another device in the WP7 stable? [Engadget]