Vivo is now slated to release a new phone called the Z5i. This has not been officially announced by the OEM; however, this device has shown up on China Telecom's website despite not having even launched yet. It is powered by the Snapdragon 675 SoC and 8GB of RAM, and has 128GB of internal memory.
https://www.notebookcheck.net/The-Vivo-Z5i-leaks-via-its-own-carrier.442111.0.html