Feb. 9 2010
It's already out ;) Book 7 is to come out in May 2011
It will Come out in September, 2009
it will come out 7/9/12
It is out now (in the usa)
It is already out.
In 2013.
The Clique book "boys r us" come out July 7. Hope this helped.
December 7, 2010
2013
February 7, 2012
The sixth book, Darke, was released on June 7, 2011.
The fifth book, The Blood of Olympus, comes out on October 7, 2014.