It sounds like Lois is planning on using the movie to out Clark for Jordan's sake. I'm not sure that's necessary, though. Couldn't Jordan reveal the fact that Superman had kids with an Earth woman? Er, I suppose that might not work, given what everyone thinks about his relationship with Lois. Not giving up his identity but saying he had kids would probably lend credence to the idea that he had an affair with Lois.

What if Jordan claimed that Superman married Ultra Woman after Zara left Earth? How was she explained?

"It is a remarkable dichotomy. In many ways, Clark is the most human of us all. Then...he shoots fire from the skies, and it is difficult not to think of him as a god. And how fortunate we all are that it does not occur to him." -Batman (in Superman/Batman #3 by Jeph Loeb)