Change record status: 
Project: 
Introduced in branch: 
8.x
Introduced in version: 
8.0-dev
Description: 

The template.php file present in theme folders is renamed to THEMENAME.theme to eliminate ambiguity around "the template file" vs. "template files".

Before:

core/themes/seven/template.php

Now:

core/themes/seven/seven.theme

Impacts: 
Module developers
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Not done