Sony Xperia M5 now official

Along with the Xperia C5 Ultra, Sony has also made official the super mid-range Xperia M5 which features a 5-inch Full HD display, MediaTek Helio X10 CPU, 21.5MP camera with hybrid AF, 4K video recording, and a water-resistant body.

Sony Xperia M5 specs:
5-inch Full HD display, 441ppi
Mobile BRAVIA Engine 2
2.0GHz MediaTek Helio X10 octa-core 64-bit CPU
IMG Rogue G6200 GPU
3GB RAM
16GB internal storage
up to 200GB via microSD
21.5MP rear Exmor RS camera w/ Hybrid AF F2.2
ISO up to 3200, 4K video recording
13MP front Exmor RS camera w/ AF
Dual-SIM (optional)
4G LTE, 3G HSPA+
WiFi
Bluetooth 4.1
NFC
GPS, A-GPS, GLONASS
IP65/68 rating
2,600mAh battery
Android 5.0 Lollipop
145 x 72 x 7.6 mm
142.6 g
Gold, Black, White

Like the Xperia C5 Ultra, the Xperia M5 also comes in single and dual-SIM variants and will be available from mid-August.

source: Sony