Index: wordpress/wp-includes/capabilities.php
===================================================================
--- wordpress/wp-includes/capabilities.php	(revision 154135)
+++ wordpress/wp-includes/capabilities.php	(working copy)
@@ -1204,6 +1204,8 @@
  * @return bool True if the user is a site admin.
  */
 function is_super_admin( $user_id = false ) {
+	$is_super = false;
+
 	if ( ! $user_id ) {
 		$current_user = wp_get_current_user();
 		$user_id = ! empty($current_user) ? $current_user->id : 0;
@@ -1217,13 +1219,13 @@
 	if ( is_multisite() ) {
 		$super_admins = get_super_admins();
 		if ( is_array( $super_admins ) && in_array( $user->user_login, $super_admins ) )
-			return true;
+			$is_super = true;
 	} else {
 		if ( $user->has_cap('delete_users') )
-			return true;
+			$is_super = true;
 	}
 
-	return false;
+	return apply_filters('is_super_admin', $is_super, $user);
 }
 
 ?>