Specifically, the initiative breaks down as:
- Contextual blocks: Provide the ability to pass in relevant configuration data to blocks so they can react on something other than the URL of the request.
- Blocks everywhere: Make all page elements—from the site logo to menus to the main page content—into blocks which can be treated the same.
- Multiple page layouts: Choose from either pre-configured layouts such as "3-Column" and "Grid" or make your own custom layouts for pages.
- Partial page rendering: Allow for individual page components to be loaded and rendered independently, allowing for better performance and independent AJAX requests.
- Better UI/UX to manage blocks: A visual, drag and drop interface for creating page layouts and populating with blocks.
You can join the discussions in the Blocks and Layouts Everywhere Initiative on groups.drupal.org and help work on Layout issues on drupal.org.