The 5.5-inch Nubia 17 is only a few months old, but ZTE may already we preparing to reveal a smaller 5.2-inch Nubia 17s complete with dual rear cameras and potentially the same Snapdragon 835 SoC.
https://www.notebookcheck.net/ZTE-expected-to-announce-Nubia-Z17s-smartphone-on-October-12.251896.0.html