"Thor-ness" used to be transferred via Mjolnir, so someone worthy would pick up the hammer, beef up, and Thor would be behind the steering wheel.
Then some shit went down (Fear Itself, he died etc.) and Thor was reborn as just Thor, not a hammer-transfer type deal. Soooo the issue is a bit weird because from what we can tell by cover art, the Male Thor is going to be running around still but with Jarnbjorn instead of Mjolnir.
So, clearly Male Thor’s conciousness is staying right where it is, and it seems like he will probably keep some of his power like his strength but probably not anything else. So Thor is still his name, but not his title kind of, because it seems like he no longer has “The Power of Thor” which the hammer grants… so the new Female Thor sounds like she’ll pick up the “Thor: God of Thunder” thing…. like a job vacancy or something.
SO: from what I can guess there are two Thors running around, Thor is still Thor so people can stop screaming about that, and a woman will be the new God of Thunder (AKA Thor).
So that’s that settled. I’m not going to even try and address that “He’s the OdinSON, Thor can’t be a woman!!!1!!” nonsense.