This is a YAML for Drupal with reduced complexity. It contains one multi-column theme and have no theme settings support build in. This reduces complexity and removes some advanced functionality, but should help beginners not so experienced with Drupal advanced theming. Additional if you don't like to use theme settings at all - this might be your release.
The YAML CSS Framework build into this release is completely the same as in the normal YAML for Drupal release.