As of yet there is no title, it's still in development.
EXTRA ANSWER
It is called Heroes of Olympus.
The new series will be called 'Heroes of Olympus'.
The series is called The Heroes of Olympus. The first book is called The Lost Hero.
The Kane Chronicles or something like that.
the new series is called the Kane chronicals
the series is called the Kane adventure's and the first book in the series is the red pyramid
it will be called the jordanth series, there will be a new boy
the jordanth series i believe.... Actually, it's called Heroes of Olympus.
Yes he is its called the red pyramid
A sequel of The Percy Jackson series is coming out in october called The Heros of Olympus.
The first book in Rick Riordan's new series titled the Heroes of Olympus is called the Lost Hero, which will be released on October 12th, 2010.
He's starting a new series called the "Heroes of Olympus," the first book of this series is named "The Lost Hero."
Rick Riordan has not disclosed any of this information, but it will involve new characters and won't be called Percy Jackson most likely.