Yes he is, although he's not a main character and its not told by him. They mention him and he's still there, but he's not telling the story.
05.05.2012.
It is the 2 installment in the heros of Olympus series
fall 2013
The Lost Hero
Leo and Piper do not die in the Hereos of Olympus.
The third book has been announced as the Mark of Athena. The book is tied to Annabeth.
I heard that there's supposed to be 5 books, like Percy Jackson.
A sequel of The Percy Jackson series is coming out in october called The Heros of Olympus.
The Last Olympian was the last Percy Jackson book in the series, and is the last book from Percy's point of view, but he will still be a character in The Lost Hero (Heros of Olympus), which is told from third person... Well, at least, that's what I think. But the next book in the Heros of Olympus series which is going to be The Son of Neptune (I think), there will probably be more of Percy than Jason... But correct me if I'm wrong because I didn't read TLH yet ;)
The heros of Olympus includes Percy Jackson and some new characters
No there will not be they have another serise about it with the same carecters and everything. It is the next serise. It's called the heros of olympus.