Writing a novel

This is my tenth year participating in NaNoWriMo, hoping for my ninth win (2012 was a blowout for several darned good reasons). I thought I was writing a different story, and it turned out to be a prequel to my series. Book 1 is finished, book 2 is almost done written, book 3 is planned for a future novel-writing month. I have a vague plan to write all of the pieces then edit them en masse.