We don't have much information but a TENAA certification and sighting usually mean that a device is coming very soon. Spotted recently at the Chinese FCC is the OPPO R7S Plus which is obviously an enhanced variant of the OPPO R7S which we also saw first on a TENAA page.
The OPPO R7S Plus was already certified on TENAA a few weeks back but the phone manufacturer decided to update the specs. The information now lists it will have 4GB RAM and 32GB or 64GB built-in storage. Other specs include a 6-inch screen with FHD 1920 x 1080p resolution and 2.5D glass, Snapdragon 615 octa-core processor (and probably a MT6795 Helio X10 version), an 8MP selfie camera, 13MP rear camera, and a 4100mAh battery.
The new and upcoming OPPO phone runs Android 5.1 Lollipop out of the box and is topped by the ColorOS 2.1 UI. There's also 4G/LTE connectivity and dual SIM support. The battery is expected to work with VOOC fast charging technology and probably will last all day just like in the OPPO R7s variant.
Specs are premium so we're not expecting this to be a mid-range phone although it only has a Snapdragon 615 chipset. That 4GB variant somehow makes it "high-end", thus, the possibility of a price tag that reads above $500 (around 3299 Yuan). We heard it might arrive in November but there's no official announcement yet so let's just wait and see.