Ready to move to Drupal 8 and have a giant custom theme standing in your way? In this talk, we'll look at what's changed in Drupal 8 theming and what needs to change in your theme. Many improvements have been made to the theming system. We'll look at:

• Managing theme resources
• Twig vs. PHP Template syntax
• What happened to renderable arrays
• Preprocess funcations
• Responsive tools in core

We'll also discuss at some things you might want to do to refactor your theme while you're upgrading it.