When does American Chopper return?

The series centers on Paul Teutul Sr. and his son Paul Jr. (frequently called Senior), who manufacture custom chopper-style motorcycles. The series originally aired on Discovery Channel beginning in March 2003. In December 2007, the series moved to Discovery's sister channel TLC, starting off with an 18-hour marathon. In July 2010, TLC announced that the Teutuls would return in a new series, American Chopper: Senior vs. Junior.