Lenovo ZUK Z2 was launched back in June this year. It will be updated to Android 7.0 Nougat soon.
However, there is nothing to specify regarding this, as it is more of a confirmation. None other than Chang Chen, ZUK CEO confirmed this.
We have no news regarding ZUK Z2 Pro that whether it will be also updated to the Android Nougat platform or not. It makes no sense that the Android version of ZUK Z2 is updated but that of ZUK Z2 Pro is not so we assume Android version of ZUK Z2 Pro will also get an update soon.