Grabbed all the latest from the unity arkit summer 1.5 branch (per the article) plugin here on bit bucket. I have all the pre-requisites (xcode -9b3, 11.3, 2017.31f.1).
Created a new project with the ARKIT.
Opened the arkitscene example
Checked the camera and only see horizontal (no vertical).
You caught us doing some quick maintenance, temporarily restricting your repository to read-only access.
Issue #13 resolved