The source of this came from the Citibike twitter feed, @CitibikeNYC for those following along.
Streetsblog reporter, Noah Kazis explains more in this article:
Citi Bike Launch Pushed Back From July to August
The city’s bike-share system will launch in August, not the previously announced start date of July, according to the Citi Bike Twitter feed.
Two months ago, city officials announced that New Yorkers would be able to start taking trips on the new public bike system by late July. Now bike-share operator Alta is telling prospective bike-share customers that the launch date will come in August.
Confirmation of the delay came over Twitter, where Alta responded to a number of city residents eager to start riding. “Hi David, thanks for your continued support and interest in Citi Bike! Look for the launch in August,” said one tweet last week. “You’ll be able to sign up for memberships next month,” said another. In another sign that the wait for the launch will extend past July, the Citi Bike team has added a set of public demos to its events calendar, with dates through August 1.
Read more here.