--- wp-admin/includes/template.php
+++ wp-admin/includes/template.php
@@ -277,6 +277,8 @@ function get_inline_data($post) {
 	if ( post_type_supports( $post->post_type, 'post-formats' ) )
 		echo '<div class="post_format">' . esc_html( get_post_format( $post->ID ) ) . '</div>';
 
+	do_action('get_inline_data', $post);
+
 	echo '</div>';
 }