Justice League: Every Character Confirmed So Far
3. Lois Lane
Confirmed By: Warner Bros included her as part of the cast confirmation way back in 2014, and then she got her own brief moment in the Justice League trailer.
Plot Prediction:
As we were somewhat confusingly told in Batman v Superman, Lois Lane is the key. Whether she's still the key, or if the timeline has now been changed (or is BEING changed), remains to be seen, but it would be nice to get an answer to what she was supposed to be the key to.
Unfortunately, Amy Adams confirmed pretty early on that she wasn't on set for much time at all, suggesting she's not involved all that heavily. We can probably expect her to appear when Superman comes back from the dead, for a non-essential reunion (at least to the main drive of the narrative).
So don't hold your breath for an answer to that key question.