Although we don’t know more details, but we can make sure that it would be Nokia Lumia 825 with Windows Phone 8, and it also has a Carl Zeiss camera with double flashes on the back and a front camera. The differences between Lumia 820 and Lumia 825 are that built-in storage would be upgraded to 16GB and support of Card expansion.
And size of screen of Lumia 825 is between 4.0 and 4.3 inches. Rumor said that its screen will be equipped with PureMotion Super Sensitive technology. On Feb 2013, we will see its official appearance.