An image of the unannounced Sony Ericsson Xperia duo has been leaked in what appears to be a Sony Ericsson promotional poster. While most of the specs remain unknown at this point, as its name implies, the device is largely expected to pack a dual-core processor. The image also indicates that the phone may feature a forward-facing camera and more subtle menu buttons below the display than most other Android phones. There’s no word on just how big the screen is, either, but it looks like it’s definitely bigger than 4.3-inches. HTC, Motorola, LG, and Samsung all have dual-core smartphones on the market, too, so we wouldn’t be surprised to see Sony Ericsson try to get this out the door quickly.