The latest version of Windows Phone will be available soon with additional support for multi-core processors, HD screen and support a wide range of sensors and chips such as NFC, Skype integration, and improved support for cloud services. A leaked document comparison between Windows Phone 7.8 and Windows Phone 8 in WP7Forum.ru circulated through yesterday, and from the pictures below we can see the differences that exist in both.It appears that Windows Phone 8 more complete and more perfect than the integrated Windows Phone 7.8. Striking differences seen in the use of a browser, Windows Phone 8 using Internet Explorer 10 while Windows Phone 7.8 using the Internet Explorer version 9. In addition to the Skype service on Windows Phone 8 is fully integrated with the device and Cloud services on Windows Phone 8 more complete and surpass Windows Phone 7.8. source
