Downton Abbey fans in the US will have to wait until Jan. 5 to watch season five of the popular period piece, but fortunately, we can get a first look at all the upcoming drama in the recently released trailer. The video raises more questions than it answers, but a few things seem certain: Lady Mary Crawley's love life is as complicated as ever before, there's a big secret, and Mary's and Tom Branson's kids are growing up quickly. Yes, "the world is changing," as Lady Edith Crawley points out, and not everyone is adjusting so well. Also, is that a fire breaking out in our cherished castle? Say it isn't so. Watch the trailer below, and then check out the official season five pictures!