This sounds like a really, really blatant attempt to grab some attention by Marvel for the Thor title in my opinion. And considering the recent revelation that Angela is in fact Thor's sister; a revelation that I suspect now is build-up for this switchover. Which you know is only temporary and after a bit, they'll be back to the status quo.
They did it for the Superior Spider-Man, for Captain Bucky Barnes America, this smacks of more of the same.
As for the hair ... magic dye job?