I picked up the new Thor the other day. It's been many years since I followed Marvel comics, but they've done interesting things with Thor over the years, including Beta Ray Bill (an alien) and Thunderstrike (Eric Masterson, fused to the spirit of Thor to save his life). So having a woman pick up the hammer seemed like a new way to examine what it means to be Thor.
What I didn't know because I haven't been following the storylines is that this is actually a logical outgrowth of recent developments in Asgard -- or rather, Asgardia, which has recently been ruled by Freyja the All-Mother. Odin has returned, and he expects everything to revert to the patriarchal status quo. I don't think he's going to be happy with how things play out -- especially once he meets the new Thor.
So who picked up Mjolnir? Who was she before she became Thor?
It could have been Freyja, who was told, "It is time you remembered your place in that world," but Asgard needs Freyja as much as it needs Thor. Besides which, she also said, "Worthiness should not be defined by the whims of magic weapons." So it is highly unlikely she picked up the hammer to become, in effect, her own daughter.
We may know in time, or Jason Aaron may plan on saying that it doesn't matter -- she is Thor and all else is irrelevant. I'll be following this comic for at least the first year of its new run to see how the story develops. I think it has a lot of potential.
Meanwhile, I'll reread this issue, stopping to star at some of the incredible art (love the frost giants striding across the bottom of the ocean!) and evocative colors (Some of the lighting effects on the moon are amazing). Right now, my favorite panel in the comic is the appearance of the "S" on Mjolnir's inscription. My only hesitation on the art is the little peekaboo panel in Thor's midriff, held together with a metal clip, which seems unnecessary. Then again, it does sort of fit with the hip fabric held together with chain links, so I may decide over time the costume works as a whole.
Time will tell.