Posted by gábor hojtsy on September 21, 2012 at 9:56am
One of the big goals of the Blocks and layouts initiative is to make Drupal layouts swappable and pluggable. We started working on how that should work with the plugin system so themes (and even modules and install profiles) could equally define layouts with .tpl.php and CSS files (describing the layout with a .yml file). We want to keep the possibility to tightly control the layout if the project requires but also to make it possible to swap layouts if so desired.
Feedback on the file structure and general approach is very welcome on the issue (read the issue summary for a rundown of changes proposed).