The surprise announcement will conclude the journalism drama, which is set at a fictional cable news network and stars Jeff Daniels, who won an Emmy for his role. The third and last season will premiere this fall. The announcement marks the second HBO drama series to get an end date in recent weeks; the network is also concluding Boardwalk Empire after this fall’s fifth season. Meanwhile HBO launched its latest drama series on Sunday night, True Detective. Ratings for the new program are not yet released, but we will post them as soon as they’re available.