Not a lot to go on here, but that's supposedly the Sony Ericsson Anzu -- slated for a Q1 2011 launch, Gingerbread on board (yes the screenshot shows Eclair), 4.3-inch screen, HDMI out and is "very, very slim."
Anyone who has used any of SE's phones knows that the build quality and materials are absolutely top-notch. (see our X10 review). The phones are amazing to hold and use, but the software and time to market leave a lot to be desired. Let's hope SE learns from past mistakes, and gets this beauty (as spec'ed) out come late winter. In the meantime, let's analyze and tear apart this rumor in the forums! [Xperia X10 blog via @tejstar]