BEVERLY HILLS, Calif. (AP) -- PBS says a Ken Burns documentary on the Roosevelt family is in the works for 2014.
"The Roosevelts: An Intimate History" is a seven-part documentary that runs 14 hours long. It will focus on three members of the political family: President Franklin D. Roosevelt and his wife, Eleanor, and President Theodore Roosevelt.
Meryl Streep, Paul Giamatti and Edward Herrman will provide the voices of Eleanor and cousins Theodore and Franklin.
In 2013, PBS will air "Constitution USA with Peter Sagal," a road trip by the National Public Radio host to see the document in action.
PBS also announced Saturday that Viking River Cruises has extended its sponsorship of "Masterpiece," the home of shows including the hit drama "Downton Abbey." Viking will sponsor the showcase for two more years.

BEVERLY HILLS, Calif. (AP) -- A "Downton Abbey" sneak peek of season three reveals that fireworks will fly between matriarchs played by Maggie Smith and newcomer Shirley MacLaine.
The aristocratic Crawley family endures a financial crisis. And, despite the engagement of Matthew and Mary at the end of last season, all is not well -- gasp! -- with the pair portrayed by Dan Stevens and Michelle Dockery.
PBS showed brief clips from next season to the Television Critics Association on Saturday before a panel discussion with cast members and producers of the international hit.
They took a break from taping in London to meet reporters in Beverly Hills, Calif.
"Downton Abbey" returns in September in the U.K. and next January on PBS.

LOS ANGELES (AP) -- A fog machine malfunction at a Teen Choice Awards pre-party has sent six people to the hospital and forced the evacuation of a Hollywood nightclub.
Los Angeles Fire department spokesman Brian Humphrey said about 400 people were attending a concert for the boy band Midnight Red when the machine released a large amount of carbon dioxide Saturday.
Humphrey says that within seconds, there was zero visibility inside the Avalon nightclub. He says the accident prompted the club's staff to evacuate the venue.
He says six people, ranging from 8 to 20 years old, were taken to the hospital for problems ranging from headaches, dizziness, shortness of breath, and cryogenic burns.
The band tweeted that the accident caused a "small panic" and blamed fire marshals for canceling the concert.

NEW YORK (AP) -- A film trailer featuring mobsters firing automatic weapons into a movie audience was still running in some theaters, even after Warner Bros. pulled the promo following the Colorado shooting during a screening of "The Dark Knight Rises."
Moviegoers from Connecticut to California complained on social media that the trailer for "Gangster Squad" played when they saw "The Dark Knight Rises" on Saturday. The film stars Sean Penn and Ryan Gosling. In a climactic scene, mobsters shoot from behind the screen at a crowded theater audience.
Theaters still playing the trailer appeared to be relatively few. Warner Bros. said it was working with exhibitors to remove the trailer from any theaters still playing it.