The technical specifications of the Lenovo Vibe X3 have been leaked on benchmarking website GFXBench
The phone runs on Android 5.1.1 Lollipop, and boasts a 5-inch Full HD 1080p Display.
The Lenovo Vibe X3 reportedly powered by a 1.8GHz hexa-core Qualcomm Snapdragon 808 processor, with 3GB of RAM, and an Adreno 418 GPU.
It comes with 32GB of onboard storage (and expandable storage as well).
The Vibe X3 sports a 20 megapixel rear camera with dual-LED flash, and an 9 megapixel front camera. The phone comes with a plethora of sensors such as Accelerometer, Compass, Magnometer, Hall Effect Sensor, NFC, Proximity sensor, Gyroscope, Light sensor, Pedometer, Thermometer and GPS.
The Lenovo Vibe X3 is a single SIM device, which according to the source (linked below) is a Nano SIM card slot which supports 4G LTE. The phone is touted to feature a fingerprint scanner at the back, and also will have dual front speakers with support for Hi-Fi 3.0.
The Lenovo Vibe X3 is expected to be released at the IFA trade show in September.
source: GizmoChina, and GFXBench
