Six Zenfone 4 phones appeared on the Asus Zentalk forum. A screengrab from Google Supports site revealed the Zenfone 4 Max, the Zenfone 4 Pro, the Zenfone 4 Selfie and three different versions of the Zenfone 4 flagship are approved for Google services.
The Zenfone 4 Max (ZC554KL) comes with a model name ASUS_X00ID and is a direct successor to the Zenfone 3 Max. It is expected to have a large battery but midrange specs.
The Zenfone 4 Pro is a new device within the Zenfone series so we are yet to find out where it’s positioned. All we know so far is the model name ASUS_Z01GD.
The Zenfone 4 Selfie is a phone that appeared on GFXBench, and we know what some of the specs are. The device with model name ASUS_Z01MD will have a Snapdragon 625 chipset with eight Cortex-A53 cores, clocked at 2.0 GHz.
It will have a 16 MP camera on the back with 4K video recording, and a front one with a 12 MP sensor that shoots in 4K as well.
In the list, we also see three Zenfone 4 devices. Looking how Asus handled its Zenfone 3 series, we might expect two different RAM/storage configuarions. The third version is called Zenfone 4V and is going to be exclusive on Verizons network.
Asus was planning to launch the Zenfone 4 series in May, but design overhaul and efficiency updates postponed the release to July.
Source (in Chinese) | Via 1 Via 2