Played by William Hurt, the Army general with an ongoing love-hate relationship with the Marvel heroes since his introduction to the MCU in 2008’s The Incredible Hulk is heard in the trailer speaking to Natasha Romanoff about how she “had to leave in a hurry,” which it seems safe to say is a reference to her evading capture at the end of Captain America: Civil War.
As previously mentioned, the Black Widow trailer sports an appearance by an old friend of the Avengers: Thaddeus “Thunderbolt” Ross.