Actually from the various information presented Thor isn't female he is proven unworthy and thus there is a new Thor who is female. In art released shortly after announcement on the View (really Disney this is your idea of corporate synergy) it shows the Odinson like he is those time-jump images, wielding an axe and sporting a mechanical arm.
Also Sam Wilson, aka the Falcon, is the new Cap and I do like the new costume. It adds elements from that great Commander Rogers design, which I also like is Jim Hammond's new costume. Remender is still writing it though so I'll probably end up passing on the new series.
Anyway these two announcements are just part of what Marvel is calling "Avengers Now!". We will also see Iron Man moving to San Fransisco and getting new armor that looks like a iPod. He is also the now the Superior Iron Man, since I am guessing like Otto he is a smug ass that will no doubt end up causing more damage than anything else.
Plus Marvel is going to try to push the Inhumans as the new mutants, again. I guess after the failure that was Inhumanity Marvel still hasn't learned. Also regarding all the talk about Marvel getting prissy with Fox over the X-Men and Fantastic Four movie rights and shunting them off into their own little spheres, I am fine with that. Thanks to that I get to avoid that horrible mess that is going to be Axis.
Plus we are going to get new series for Bucky, Doctor Strange, and Deathlok. And possibly new books for Angela and Ant-Man.
I guess Marvel's plan here is to take their biggest name right now and try to drum up some press by making these radical new changes. The problem is that all of this reminds me of the 80's. Replacement heroes and all that jazz. Hell Angela and her introduction into Marvel universe reminds me of the Chartlon characters. Or even Demon Hunter from Atlas/Seaboard becoming Devil-Slayer. You can even draw some parallels between Atlas/Seaboard and Image while you are at it.