When does Caillou: Rosie the Giant return?

Caillou (transl.?pebble or stone; /k??j?, -ju?/ ? kah-yuu, -?yoo; French: [kaju], stylized in lowercase) is a Canadian animated children's television series that aired on Teletoon (both English and French versions), with the first episode airing on September 15, 1997. The series was produced in Canada by the CINAR Corporation (later Cookie Jar Entertainment), while the fifth and final season was produced with the South African studio Clockwork Zoo. It aired on PBS and the PBS Kids Channel.