I use the term “skin” because it harkens to various systems in days gone by where designers simply added CSS to skin a site. WordPress themes will always be a bit more complex than a simple stylesheet but not much more so. We will be getting back to the basics of CSS and HTML.

This is a very refreshing prospect. :)

It's too bad that the preview on WordPress.org doesn't do it justice. Improving previews could help the goal of powering 50% of the web.