Ever since Sony Ericsson joined the Open Handset Alliance back in December last year, we’ve pretty much assumed they were working on a Google Android-based smartphone, but the company has kept mum on its plans. Thanks to some recently leaked documents uncovered by Danish site Mobil, however, we now have photos and details of the upcoming device.

Code-named “Rachel,” the smartphone is expected to be officially announced later this year as part of Sony Ericsson’s expanding line of Xperia products, which so far includes the Windows Mobile-based X1 model. It is based on the Qualcomm Snapdragon platform (QSD8250), capable of up to 1GHz processor speeds and 7.2Mbit per second HSPA downlink speeds, and will feature a promising 8.1-megapixel camera with autofocus and flash. In addition, the phone boasts a pressure-sensitive touch screen that measures roughly 4 inches diagonally, as well as a 3.5mm headphone jack and a miniUSB port.

Depending on its release date, Sony Ericsson’s upcoming device could run Android 2.0 – also known as the Donut update – and perhaps even offer Flash support. That, however, is just speculation for now.