This Asus phone runs Android Nougat, features a 4850 mAh battery, and could be a ZenFone 4
According to China's Telecommunication Equipment Certification Center (aka TENAA), the X00GD runs Android 7.0 Nougat, so it could become the very first Asus phone to ship with Nougat out of the box.
Measuring 149.5 x 73.7 x 8.85 mm and weighing 169 grams, the new Asus smartphone is powered by an octa-core 1.5 GHz processor of unknown provenience, further featuring an 8 MP front-facing camera, a 13 MP rear camera with dual LED flash, and microSD card support. It looks like the phone has several variants - with 2 GB, 3 GB, or 4 GB of RAM, and 16 GB, 32 GB, or 64 GB of storage space.
While we don't have evidence to support this, the X00GD might be a member of Asus' upcoming ZenFone 4 family, which is expected to debut in 2017 (following the ZenFone 3 series released this year).
Asus already confirmed that it would announce new ZenFone handsets at CES 2017 next week, so we might see this interesting X00GD then. We'll probably also see a new ZenFone Zoom at CES. Stay tuned!