Sony has just announced the Xperia Z4 in Japan, and its near identical to the outgoing Z3. It does have a few improvements though.
The Xperia Z4 is 6.9-mm-thick (0.4mm thinner than the Z3) , weighs 144g (8g lighter than the Z3) clad in a metal and glass body, includes a 5.2-inch 1080p LCD screen, a 20.7-megapixel camera, a 2930mAh battery (17 hours talk time over 3g is claimed), a 2GHz 8-core 64-bit Snapdragon 810 processor, and 3GB of RAM, running Android 5.0 Lollipop and is water- and dust-resistant, IPX5/IP68 and IP6X with no flaps over the USB port too.
The front camera is 5.1mp with a 25mm wide angle affair. The photo editing allows for plentiful face and skin touch ups, and adding AR effects too. The rear camera is the same 20.3m G Sensor but with ISO settings up to 12,800. Shame there is still no optical image stabilisation but Sony did add a cooking mode! The Z4 offers LDAC high quality wireless playback.
The full specs are –
– Dimensions – 146mm × about 72㎜ × about 6.9㎜
– Weight – 144 g
– Battery capacity 2930mAh
– Display 5.2 inch Liquid crystal Birds Luminous display for mobile, 1920 x 1080
– OS Android ™ 5.0
– Built-in memory (ROM / RAM) 32GB / 3GB
– SD memory card slotmicroSD, microSDHC, microSDXC (maximum 128GB)
– Processor 2.0GHz / 1.5GHz
– External connection Bluetooth® Bluetooth® 4.1
– External device microUSB / MHL / headset connection terminal, DLNA
– Sony Mobile original software – Music applications, such as album application
– Main camera About 20.7 million pixel back-illuminated stacked CMOS sensor Exmor RS for mobile
– Front camera About 5.1 million pixel back-illuminated CMOS sensor Exmor R for mobile
– Camera shake correction – electronic (video / still image), Auto focus (video / still image),Self-timer,
– Main camera – 4K (2160p), full HD 60fps (1080p) / full HD 30 fps (1080p) / HD (720p) / VGA (480p) / MMS
– Front camera – full HD (1080p) / HD (720p) / VGA (480p) / MMS
– Photos – 20.7MP (4: 3) / 15.5MP (16: 9) / 8MP (4: 3) / 8MP (16: 9) / 3MP (4: 3) / 2MP (16: 9)
– Front camera – 5MP (4: 3) / 3.7MP (16: 9) / 2MP (4: 3) / 2M (16: 9)
– Flash main camera only Smile Shutter Waterproof / dustproof (IPX5 / 8, IP6X)
– NFC –
– Wi-Fi IEEE802.11a / b / g / n (2.4GHz / 5GHz) / ac compliant, MIMO support
Source – http://www.sonymobile.co.jp/company/press/entry/2015/0420_1_xperia_z4.html
So does the Sony Xperia Z4 interest you?

Not me, but a friend who has my old Z1 and is looking to upgrade will be interested. He has a Tablet Z2 and the latest Bravia 3D tv, so will stick with Sony I think.
Z4 isn’t a huge leap from the Z3 spec wise, certainly not design wise. Maybe the Z5 will change things. Have to say I’m somewhat disappointed.
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As the owner of a Z3 Compact, I’m delighted they haven’t made me feel like I threw my money away. I guess just bumping up the Sony are just stuck in a holding patter
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