New features

As of RC1, you no longer need an html.html.twig in your AMP subtheme.

A number of changes have been made in AMP Base's html.html.twig: deleting html.html.twig from your subtheme is the easiest way to take advantage of these updates. Make sure to review any customizations you may have made to your html.html.twig before deleting it.

As of RC1, you no longer need an html.tpl.php in your AMP subtheme.

A number of changes have been made in AMP Base's html.tpl.php: deleting html.tpl.php from your subtheme is the easiest way to take advantage of these updates. Make sure to review any customizations you may have made to your html.tpl.php before deleting it.

Brand new theme with less bells and whistles but more versatility

Changes since 8.x-1.0-beta5:

Changes since 7.x-1.0-beta4: