Add news item for new-style exception class branch merge.
diff --git a/Misc/NEWS b/Misc/NEWS
index 7982af1..8d1063d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,10 @@
 Core and builtins
 -----------------
 
+- Builtin exceptions are now full-blown new-style classes instead of
+  instances pretending to be classes, which speeds up exception handling
+  by about 80% in comparison to 2.5a2.
+
 - Patch #1494554: Update unicodedata.numeric and unicode.isnumeric to
   Unicode 4.1.