The Sony Xperia M5 has been already on sale, or at least in Taiwan at a price to change around $410 perhaps somewhat higher price for its specifications, but plus is that you are paying for Sony and waterproof.
Newly launched Sony Xperia M5 is already on sale in Taiwan
In case you do not remember the specifications, the Sony Xperia M5 is built around a display of 5 inches to a full HD resolution of1920 x 1080 pixels being driven by a grateful SoC MediaTek Helio X10 (8x Cortex-A53 @ 2.00 GHz + GPU PowerVR G6200) matched to 3 GB of RAM, 16 GB of storage expandable and integrates a battery of 2600 mAh. We also know that provides a generous camera, Sony IMX230 of 21.5 megapixels (same sensor found in the Style Moto X), while the front will also have a sensor 13 megapixel without flash LED. It is waterproof, dustproof, is 7.6 mm thick and offers 4G LTE connectivity, 802.11n WiFi, Bluetooth 4.1, GPS + GLONASS, NFC, FM radio, microUSB 2.0 and operating system Android 5.0 Lollipop.