A look at the unreleased Windows Phone 7.8 upgrade
"...they promised us an update, an update that would bring down some prominent WP8 features to existing devices. They called this update Windows Phone 7.8. In this review, we’ll be covering the new updates and features that Microsoft and Nokia packed into WP7.8 for the Nokia Lumia 900."
A full review of Nokia's latest flagship, the Lumia 920
"The Lumia 920 runs Windows Phone 8, Microsofts latest version of their mobile operating system. Having used Windows Phone 7.5 for over a year,WP8, just like the Lumia 920, has received improvements in almost every aspect. From the revamped Start Screen all the way down to the OS core underneath."