Huawei had announced about a month ago the Oreo Beta program for Huawei Honor 7X. The time has now come for the arrival of its update. Those users who had got enrolled into this program have now started getting the emails for the beginning of the rollout of this update.
It has also been mentioned in this email that it is going to be a staged rollout. It was also stated that all the eligible units are going to get the beta update by the end of this week. More to Oreo, this update has also included the EMUI 8 skin. The final update of Android Oreo will be arriving in the second quarter of 2018.