• Support for custom post type permastructs.
• Automatic integration with the Rewrite Rule Testing plugin.
• Query variables for front-end filtering via the site_filters argument.
• Query variables for front-end sorting via the site_sortables argument.
• Filters for the post type arguments and names (ext-cpts/{$post_type}/args and ext-cpts/{$post_type}/names).
• Support for outputting multiple values per key in post meta admin columns.
• The default value of the link argument for admin columns is now list.
• The filters argument has been renamed admin_filters.
• The cols argument has been renamed admin_cols.
• The right_now argument has been renamed dashboard_glance.
• Remove the backwards compatibility with pre-2.3 plural, slug, and singular arguments.