The names' Z4, Xperia Z4. Licence to... be very similar to the Xperia Z3 in almost every way. That's right, Sony has a new flagship smartphone, but only in Japan.
There's been a lot of talk about the Sony Xperia Z4 and we've now seen the handset launch relatively quietly in Japan.
The main talking points are the new octa-core Snapdragon 810 processor which should give you more power - but there are concerns about it overheating - a slimmer profile (down from 7.3mm to 6.9mm) and a new wide angle front facing 5.1MP selfie camera.
The 5.2-inch full HD display remains the same, as does the 3GB of RAM, 20.7MP rear camera, 128GB microSD slot and IP68 water and dust proofing.
There's a slight concern regarding battery life, as the slimmed down aluminium body means Sony has had to ditch the 3100mAh power pack from the Z3 in favour of a 2930mAh offering in the Xperia Z4. Hm.
Available in white, black, copper and aqua green there's currently no word on its price or potential release outside of Japan - so you're stuck with the Z3 for now.