The great debate surrounding this amazing run of Thor has been, quite simply: Who IS she? I was hoping that we would get a glimpse into just who might be the woman worth enough to wield Mjolnir, but alas, issue 3 proved to be like the two before it: action-packed and interesting, but lacking in the naming department.
The interesting (SPOILER) thing in this issue was Thor, having lost touch (yes, physical touch) with Mjolnir, begins to transform back into her weaker self. The hammer has given her strength beyond her understanding. Which brings me to my new theory on who she is … rather, my comic shop guy’s theory which I am now adopting.
While I would love love love her to be Valkyrie, the thoughts she has are not the ones of a woman who is Thor’s match. That being said, my new theory (or comic shop guy’s theory, if you must) is that she is Jane Foster. Think about it. Plausible. While I am no where near a fan of the character of Jane Foster, it works.
Who do YOU think she is?
It's All Geek To Me 
That would raise the question of how Jane Foster got to the moon and survived without a space suit, as you see a bare hand pick the hammer up. I thought the first issue was leaning heavily toward Freyja, and was hoping for Carol Danvers, but I don’t think either are right.
I felt they were leaning toward Freyja too in the first issue. And she very likely could wield the hammer since (my theory) one must think themselves worthy and have no doubt about that in order to raise the hammer. That is what i think happened to Thor. He doubted for only an instant and suddenly Mjolnir was untouchable. Carol Danvers would be awesome too!