Fans of the long-running improvised comedy series Whose Line Is It Anyway? will be saying goodbye to the beloved show sometime next year.While the show coming to an end hasn't been officially announced by The CW Network, one of the show's stars - Colin Mochrie - revealed the news to fans on Twitter.The 12th season will start production in January, while the current 11th season is four episodes into its run, airing at 9 PM ET on The CW Network. End: While the show coming to an end hasn't been officially announced by The CW Network, one of the show's stars - Colin Mochrie (right) - revealed the news to fans on Twitter'Hey everyone.