When the first cover visuals for Justice League International #1 were shown, there was one unknown woman on the cover. Then, for reasons also unknown, she was removed. And on the final version, replaced with Flashpoint's Lady Godiva, who appeared in the issue in question.
Bleeding Cool speculated that she might be Alexandra Gianopoulous from the Booster Gold Flashpoint crossover, introduced into the world but seemingly forgotten about.
Well, it looks like she may be back for Justice League International #5… honest this time.