It's a blink-and-you-miss-it moment just halfway through the trailer, but it looks like one of the new Duttons will sadly be meeting their maker before the first season of "1923" is over.
As audiences will know, only members of the Dutton family are buried on the ranch's land, and next to the three graves, which appear to belong to James, Margaret, and Elsa Dutton (the name "Elsa" is just visible on the middle headstone), a fourth can be seen. It's marked with a wooden cross rather than a tombstone, which suggests that it's a recent death compared to the others.
Someone who appears to be a woman is crouched down by the grave, but it's not clear who it is, meaning that we can't rule any of the Duttons. Rather ominously, the shot of the Dutton family graveyard is immediately followed by Cara remarking: "Greed will be the thing that kills us all."