You're looking at what Oppo claims to be the slimmest smartphone in the world; it measures just 4.85mm front to back.
The R5 is the successor to the Asia-only R3. It's 0.3 mm slimmer than the already crazy-thin Gionee Elife S5.1, and its all-metal body weighs in at 155g. Amazingly, it actually contains some none-too-shabby guts. We're talking a 5.2-inch full HD AMOLED screen, a 64-bit Snapdragon 615 SoC, 2 GB of RAM, both 5 MP and 13 MP cameras, LTE radio and a 2,000 mAh battery. There's 16 GB of internal storage, but no microSD expansion.
It's not all positive, though. There's no 3.5mm headphone connector (clearly fitting one in was too much of a headache) so you'll have to use a bundled micro-USB adapter or Bluetooth. And the phone runs Color OS 2.0, an OS based on Android 4.4, which is a reasonable choice.
The R5 is due to hit the global market this December. It'll come in silver, gold and grey with an off-contract price of $500 in the US, UK pricing TBC. [Oppo]