There has been an update
http://www.spacedaily.com/reports/Ap...dated_999.html
"...the possibility of a potential impact in the years after 2029 continues to prove difficult to rule out..."
http://arxiv.org/abs/1301.1607
http://www.spacedaily.com/reports/Ap..._2068_999.html
"The new report, which does not make use of the 2013 radar measurements,
identifies over a dozen keyholes that fall within the range of possible 2029 encounter distances," reads an article prepared by a group of scientists led by Davide Farnocchia.
Still unlikely.