When does Caillou: Adventures with Grandma and Grandpa return?

Caillou (voiced first by Bryn McAuley from 1997 to 2000, then Jaclyn Linetsky from 2000 until her death in 2003, and then Annie Bovaird from 2003 to 2010) meaning pebble or stone in French (nicknamed by himself The Prince of Imagination), is the title character of the show. The series received initial positive reviews from critics and audiences, but in the years following its release, the series saw a more negative reception.