There was a blink-and-you-miss-it glimpse at the back of someone's head, and that someone seemed to be Grand Moff Tarkin!
Here's the bit you might have missed in the Rogue One TV spot:
Tarkin first appeared in Star Wars: A New Hope, where he was played by the late, great Peter Cushing.
This won't be the first time that Moff Tarkin has been resurrected for a Star Wars film. When Revenge of The Sith came out in 2005, long after Cushing's death, George Lucas hired actor Wayne Pygram (beneath a ton of makeup) to appear as the character.
We've heard for a while that Tarkin would be appearing in Rogue One: A Star Wars Story,