It seems, that ZTE has listened once again.
We don't have any information considering this update, but on a german community Sunny76 wrote, that he got a confirmation about a new Nougat Update containing the current security patch level (which at this time probably is the january patch level containing fixes against the common Meltdown / Spectre exploits).
This update seems also to be neccessary for an upgrade to following Oreo versions.
Source: Android-Hilfe (German)
We got the confirmation that the next Update will be B10 and it will contain January 5. Security patches (which include the patches concerning meltdown / spectre)
Edit 2 (07.03.2018):
Update is currently rolling out as FOTA. The download size is around 654MB.
Download is available from ZTE Germany.
- Google security patches updates, various device stability and security improvements
- Enhanced system performance and system stability