Z2 Pro coming on April 21, ZUK confirms
In case you missed, the company had recently teased a new smartphone (image shown below), which in all likelihood is the Z2 Pro.
As for the specs, the Z2 Pro is rumored to be powered by Snapdragon 820 SoC, and sport a full HD display. It'll come in 3GB and 4GB RAM options and will have 32GB of internal memory. The phone will have 13MP rear camera and a 5MP front shooter. It will run Android 6.0.1 out of the box.
There's currently no information on what price tag it will carry.