Rick Riordan's first installment of The Kane Chronicles, The Red Pyramid is set to release in book stores tomorrow, Tuesday, May 4, 2010.
Here, 你 can read the first chapter of the book --
link And here, 你 can hear from Rick Riordan himself what the plot of the new book will be --
link O68&feature=pyv&ad=5796588663&kw=kane%20chronicles
And his sequel series to the Percy Jackson & the Olympians titled The 超能英雄 of Olympus, is set to have the first book, The 迷失 Hero, released on October 12, 2010. That's what I have heard.
Hope this helps!!!