Pictures of the yet-to-be released Sony D6503 “Sirius” have surfaced. These photos show of the device in both black and white. In a side-by-side picture with the Xperia Z and Xperia Z1, we can see that Sirius will be the biggest of the bunch. With the Z and Z1 packing a 5-inch display, the rumored 5.2-inch screen isn't that much bigger.
According to the leak, the phone will come without a logo on the shatterproof protector and will arrive in April. That being said chances are we'll see it at MWC at the end of the month, as current rumors suggest.
source: Xperia Blog