Just a few days ago we saw high-res live pictures of the Xperia D6503 Sirius. It packs a 5.2" 1080p display, runs on Snapdragon 800 (MSM8974-AB chipset with a quad-core 2.3GHz Krait 400 CPU, faster Adreno 330 GPU and 3GB of RAM). At the back there's a 20.7MP camera with a larger than usual sensor, while Android 4.3 Jelly Bean with a newer version of Sony's home-baked launcher is under the hood.
The retail device will be running on Android 4.4 KitKat, but the one we are seeing today seems to be running on an older firmware build with Android 4.3 Jelly Bean. Still, the screenshots are enough to show us some of the changes coming with Sony's new launcher.