Bigger screen, Mango and possibly LTE radio.
With days to go till CES, when so many new devices are launched,Pocketnow claims to have uncovered details on the new Nokia Lumia update - codenamed Ace.
It has revealed that the device will come with 4.3-inch WVGA display, 8-megapixel camera, a front-facing camera, and 512MB of RAM. It will run Windows Phone 7.5 Mango, rather than the usual Tango.
All should be revealed next week. But this is an incremental change up from the Lumia 800. Insider chatter suggests more radical changes will emerge in the form of new handsets later this year.

http://www.mobile-ent.biz/news/read/...-leaked/016577