Great...now I’ll be one second early for all my appointments.Or is it one second late?
First paragraph:
If the day seems a little longer than usual on Saturday, June 30, 2012, that's because it will be. An extra second, or “leap” second, will be added at midnight ....
— Midnight in which time zone? Actually the leap second is added at midnight UTC or at 19:59:60 EDT.
— the third to last paragraph does mention that the extra second is inserted into UTC at 23:59:60.
Second to Last paragraph:
In the meantime, leap seconds will continue to be added to the official UTC timekeeping. The 2012 leap second is the 35th leap second to be added and the first since 2008.
— this leap second will be the 25th since 1972 and only the first since 2008
the Wikepedia report does a better job:
http://en.wikipedia.org/wiki/Leap_second
http://tycho.usno.navy.mil/leapsec.html
This leap second can be either positive or negative depending on the Earth's rotation. Since the first leap second in 1972, all leap seconds have been positive and there were 23 leap seconds in the 34 years to January, 2006.