Read carefully:
http://investors.xpologistics.com/phoenix.zhtml?c=204615&p=irol-newsArticle&ID=2380710
" in management's discretion"
" The timing and number of shares repurchased will depend on a variety of factors"
"The share repurchase authorization does not obligate XPO to repurchase any specific number of shares, may be suspended or discontinued at any time."
This is an authorization. Because it's how Wall Street people think, it's also a signal. But if business turns south or they have something better to do with the money, they're not obligated to do anything because they haven't promised to do anything.