The new text in Zefram's diff is directly from Bulletin C 43 from IERS.  Looking back at the last five years or so of the archived announcements, it seems they've used -26 and -29 almost interchangeably, going back and forth more than a few times.  (I wouldn't worry.)

--
Tim Parenti



On Fri, Jan 6, 2012 at 12:31, Ángel González <keisial@gmail.com> wrote:
On 06/01/12 11:54, Zefram wrote: 
Bulletin C 43 came out yesterday, scheduling a leap second for the end
of June 2012.  Patch attached.
-zefram

--- leapseconds	2012-01-06 10:47:32.000000000 +0000
+++ leapseconds.new	2012-01-06 10:49:42.000000000 +0000
@@ -48,40 +48,53 @@
 Leap	1998	Dec	31	23:59:60	+	S
 Leap	2005	Dec	31	23:59:60	+	S
 Leap	2008	Dec	31	23:59:60	+	S
+Leap	2012	Jun	30	23:59:60	+	S
 
-# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
+#      INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
 #
 # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
 #
 # SERVICE DE LA ROTATION TERRESTRE
 # OBSERVATOIRE DE PARIS
 # 61, Av. de l'Observatoire 75014 PARIS (France)
-# Tel.      : 33 (0) 1 40 51 22 29
+# Tel.      : 33 (0) 1 40 51 22 26
 # FAX       : 33 (0) 1 40 51 22 91
-# Internet  : services.iers@obspm.fr
+# e-mail    : services.iers@obspm.fr
+# http://hpiers.obspm.fr/eop-pc
Is the change of telephone number intentional?
The number stated in http://hpiers.obspm.fr/eop-pc/ is 00 33 (0)1 40 51 22 29 (the old one).