The update was expected to arrive this month, but now ZTE pushes the launch date of Android 7.0 for the Axon 7 handsets to a later date. Although this date is not public yet, the company says the update should arrive by the end of March.
http://www.notebookcheck.net/ZTE-delays-the-Nougat-update-for-Axon-7.194362.0.html