Consider yourselves duly warned, Downton Abbey fans. PBS has given you plenty of notice.

Season 4 of this British sensation will premiere in the United States on Sunday, January 5.

And there will be plenty of changes afoot: Matthew is dead. So is Sybill. And Siobhan Finneran has exited the series as Miss O'Brien.

Look for Gary Carr to recur as the show's first African-American character, while rumors abound that Carson may retire... Thomas may get a boyfriend... and Anna and Bates may have a baby.

We've got a long way to go, American viewers, but bookmark TV Fanatic today for all your Downton Abbey Season 4 scoop!

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.