Xperia Blog claims that the Android-based flagship device will be waterproof, dust-resistant and measure in at 139 x 71 x 7.9mm.
The Yuga smartphone - believed to be a codename - was previously leaked online by Android-Schweiz in a report that appeared to confirm the inclusion of a 5-inch display and a 12-megapixel camera.
The full HD screen will reportedly be capable of hosting images in 1920 x 1080, backed up by a 1.5GHz quad-core processor and 2GB RAM.
Also known as the Sony C6603 during production, the phone has been touted as a competitor to the Samsung Galaxy Note 2 with equally powerful specs and a similar screen size.
The Yuga - or Xperia Z - comes equipped with microSD card slot and HDMI and will allegedly run the Android 4.1.1 Jelly Bean operating system out of the box.
Sony is expected to unveil the device at one of the major trade shows next year, such as CES 2013 or MWC.