On the other hand, the alien autopsy from the trailer is being aired in a season that is revisiting the possibility of alien DNA having a role in Scully’s pregnancy (via the Cigarette-Smoking Man).
On the one hand, an alien autopsy isn’t exactly something that hasn’t happened before on The X-Files, and the dated fashion combined with the glimpse of a young man smoking a cigarette hints that this particular autopsy happened long ago.
If William is indeed a hybrid of sorts, this autopsy could be key to explaining how it all started.
An alien will be getting sliced and diced in what remains of Season 11.