DC Comics released their May 2014 solicitations earlier in the week, including the cover to Justice League United (previously Justice League Canada) #1. I was excited to have a look at the Canadian character writer Jeff Lemire had promised, but she was blacked out on the cover I saw displayed.
Yet oddly enough, she is not blacked out on the DC Comics website (and there she is at bottom right). Unfortunately, I have yet to be able to find a larger picture than the one at right, but it gives a pretty good idea of her appearance. I don't why she remains a mystery; hopefully it's because they plan on making a big deal out of her introduction.
Got to say, Adam Strange looks pretty cool in this image. And I know it's somewhat irrelevant, but...I can't help but notice that Supergirl is not on this cover as she was on the cover of #0. Perhaps our noob takes her place? We'll find out in April/May.