Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 18126)
+++ wp-includes/formatting.php	(working copy)
@@ -1875,6 +1875,10 @@
  * @return string Text with converted entities.
  */
 function ent2ncr($text) {
+
+	if( $filtered = apply_filters( 'ent2ncr', null, $text ) )
+		return $filtered;
+
 	$to_ncr = array(
 		'"' => '"',
 		'&' => '&',