A roadmap of what is supposed to come out of Huawei's stables in 2018 has surfaced during one of the presentations by the handset maker's Israeli importer. While we are already aware of the upcoming Mate 10 series, there was a revelation of sorts about the P20 sometime in Q2 2018.
https://www.notebookcheck.net/Huawei-s-leaked-roadmap-gives-a-glimpse-of-what-s-to-come-in-2018-P20-in-tow.274728.0.html