the exact date is unknown, but sometime in fall 2012. its called the mark of athena.
The tittle is The Son of Neptune and it is going to come out on Fall, 2011.
"Heroes of Olympus, The , Book Three: The Mark of Athena" has a release date of October 2, 2012 .
The Lost Hero was the first book of the series: The Hereos Of Olympus and the next book The Mark of Athena will come out in the Fall of 2012 But no one knows the exact date
"The Mark of Athena" by Rick Riordan was released in India on October 2, 2012.
The next Camp Half-Blood series is called 'The Heroes Of Olympus'. It will have Percy, Annabeth, and many other characters you'll recognize from the first series. The first book is called 'The Lost Hero'. It is set to come out October 12, 2010. If you click on the link below and type in the password (newhero) once you get there, you can read the first two chapters.
no particular date yet but it guarentees Fall 2011 the title will be the Son of Neptune refering to Percy Jackson at the Roman camp
it will come out in November not sure the date.
there is no date set yet:(
it is going to be in 2014
Monday 23rd Feb 9pm BBC2 followed by the second episode on BBC3 at 10pm
He already has written two: The Kane Chronicles and The Heroes of Olympus. The Kane Chronicles follows the Eygptian gods and our two heroes: Carter and Sadie Kane. While the Heroes of Olympus is set after PJO and includes the next Great Prophercy (said by Rachel in the last Olympain). It includes both Greek and Roman demigods.
Release Date: June 2011 is the release date