It appears that the battle between hosts and humans will be a major theme in Season 2.
We get a glimpse of Bernard and a faceless robot ominously looming behind him.
We also see Bernard smiling with Dolores, who's wearing modern clothes.
Then there's Logan in a modern-looking frozen world.
The Man in Black is back.
And so is Maeve, standing in what appears to be ash or snow.
We also get a glimpse of Teddy being grabbed from behind.
The last shot of the trailer goes to Dolores, armed and declaring Westworld "our world".
Westworld, the show that asks: what if Skynet was good, and the humans were the bad guys?