According to IGN, director Zach Snyder confirmed that the Justice League director's cut will solve a big mystery in Superman: Man of Steel, which is the secret of another escape pod next to the Kryptonian escape pod where Superman found himself born.
Attentive viewers will find that in Superman: Man of Steel, there is an unopened escape pod next to the Kryptonian escape pod containing Superman, and many people, including IGN, believe that the unopened escape pod was once superhuman's cousin, Supergirl. There's no such issue in Superman: Man of Steel or any other DCEU film, but according to director Zach Snyder, the Justice League director's cut will solve the mystery when it releases next year.
After seven years, people still don't know who or what is inside the unopened Kryptonian escape pod in Superman: Man of Steel, and even if the director says so, it is still uncertain whether this mystery can really be answered in the director's cut of "Justice League". 、