Windows Phone 8 is based on the same Windows 8 kernel, Microsoft wants to make UX on smartphones, tablets, laptops and desktops become consistent.
New features in Windows Phone 8 include support for multi-core processors (up to 64 cores), higher resolution screens, microSD cards and NFC sharing. Pre-installed apps will include Internet Explorer 10, Wallet and Nokia Maps. Read more: http://www.pcadvisor.co.uk/reviews/software/3407872/windows-phone-8-review/#ixzz2HqDQdeic
The most exciting support is the Nokia Maps consisting of Nokia Map (vs Google Map), Nokia Drive+ Beta (turn-by-turn directions better than iOS6 Map, the Release version should be better in the future), Nokia Transit (cover trans. info. of major cities within USA), Nokia City Lens. By the way, the best device of WP8 is surely the NOKIA LUMIA 920. If you are not familiar to use WP8, Nokia Care contain information about helps, tips and tricks for using WP8.
See Nokia City Lens in action