The poster for Downton Abbey Season 6 seems to have the message that all good things must come to an end.

Producer Says 'Not Everyone Will Have A Happy Ending' On 'Downton Abbey'

Released on Thursday, the poster shows the cast standing together in front of the castle dressed in their formal attire. Main members like Robert Crawley, Lady Mary and the Dowager are in sight as a colorful sky can be seen behind them. Odds are likely this is implying that the sun has- literally and figuratively- set on the series.

Welcome to Series 6 of Downton Abbey.

Posted by Downton Abbey on Thursday, 13 August 2015

There Will Be Something 'Quite Moving' When 'Downton Abbey' Ends

Meanwhile, Hugh Bonneville (Robert Crawley) mentioned that even though the show could have been "squeezed out" for more time, it was best to let it run its course after the sixth season.

"We've been blessed by having a writer who's got a fund of stories to play with, and these characters that have been fully-formed over the last six years," the actor said via BBC. "To have extended it would have been, I think, a bit of a misstep."

Bonneville then pointed out how it wouldn't have been a good idea to let the series get to a time where fans don't care to see it anymore.

"I think you want to finish when people are still a little bit sorry that it's over," he said. "You don't want to wait until it's a huge relief all round so we decided at [series] six people would be sorry there wasn't a [series] seven and that seemed right."

Downton Abbey Season 6 premieres in the United States on Sunday, January 3 on PBS.