Is there going to be another Captain Underpants in 2013?

Yes, there was a new Captain Underpants book released in 2013 titled "Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers." This marked the tenth installment in the series by Dav Pilkey, continuing the adventures of George, Harold, and their superhero creation, Captain Underpants. The book features new antics and humor that fans of the series have come to love.