Issue
Knowledge admin is able to create a new article template and fields on it.
While using the template, the new fields configured are not visible.
Cause
New fields are to be added onto the form by configuring form layout.
Resolution
The way article templates are designed is admin needs to add the newly introduced fields onto the form before using the template.
In order to view the template fields please make sure you add those on the form using Configure->Form layout beforehand.