Mark of Athena by rick Riordan is coming out October 2nd 2012
All I know is that it will come out Fall 2012 the day and month has not been released it is to early for that and so far there hasn't even been rumors.
October 2,2012
It's out!
The book will be available Oct. 2, 2012. Below is link to except to the first chapter of The Mark of Athena.
october 2nd tuesday 2012 (yesterday)
Fall 2012. It is called the Mark of Athena.
The Mark of Athena is mainly centered around Annabeth.
the tuning points of mark of athena
First chapterof Mark of Athena
the mark of athena comes out, according to the book, in fall 2012.
It must be assumed after "The Sea of Monsters" (2013) is released. If ever.