Windows Phone 8 to replace Bing with 3D Nokia Maps across the platform and integrate Skype in the phone book

Apart from the massive backend overhaul of Windows Phone 8, replacing the Windows CE with the WinRT kernel that is used in Win 8, Microsoft has added a number of front-end improvements as well, such as a new direction for the camera app, similar to Lenses. The camera interface improvements are apparently spearheaded by Nokia, as Chris Weber pointed out in an interview, with the determination to bring a Lumia phone with the PureView camera tech to retail.
source: WPCentral