It's just like September again. Bleeding Cool was the first to identify the reappearance of the "Strange Woman" from Flashpoint in the New DCU, first in Justice League #1 in the background, then in the background of every first issue. Twice in one case.
And now, with the Second Wave shipping, she's back, appearing in the background of World's Finest, Dial H and GI Combat. Not in Earth 2 however, well, that is completely set in a different dimension. I expect to see her in Ravagers #1 and Batman Inc #1 as well.
And she will also have a starring role in the DC Free Comic Book Day comic out this Saturday. Which should answer a lot of Questions...
DC New 52 Free Comic Book Day: