Instead of a pop-up mechanism that could be prone to damage, Vivo has opted to put two displays AMOLED displays on the device. There's a large bezel-free 6.39-inch display on the front (2340x1080), and another smaller 5.49-inch display on the back (1920x1080). By having a functional display panel on the back, it can serve as a viewfinder for the triple camera setup when taking selfies.
Speaking of the cameras, the main shooter features a 12MP sensor with optical image stabilization and an f/1.79 lens. There's a 2MP f/1.8 camera for depth-sensing duties and a Time of Flight (ToF) camera that is used for face unlock. You may have also noticed the ring on the back of the phone; it's called the Lunar Ring. The Lunar Ring functions as a diffuse flash for taking selfies and it also doubles as a notification indicator.
The Nex Dual Display Edition doesn't disappoint on the hardware front, as it features the brawny Qualcomm Snapdragon 845 processor coupled with a generous 10GB of RAM. There's 128GB of onboard storage, however, you won't find microSD expansion. There is, however, a 3.5mm headphone jack (which is a rarity these days), a large 3500 mAh battery and an in-display fingerprint reader (which is slowly gaining traction in the flagship Android phone realm).
Thankfully, the Vivo Nex Dual Display Edition ships with Android 9 Pie fresh out of the box, but you will have to endure the Funtouch OS 4.5 layered on top. It will launch in China in early 2019 priced at around $720.