The minute-long promo shows numerous members of the Crawley household and staff, including Mrs Hughes and Mr Carson, contemplating life outside of Downton, said The Hollywood Reporter.
During a previous press event in London in mid-August, executive producer Gareth Neame said the decision to end the show with the sixth season got the full support of ITV and PBS; both networks said they liked the integrity of the decision.
The upcoming season will premiere in the UK on September 20.