Wooooaaaaahhh I never thought of that. Personally I wasn't stoked to hear about Thor becoming a lady. Like I don't mind if he was temperarilly a girl for awhile like Lady Loki, but I like male Thor better. That being said, if it were just a twist and ended up being Kelda! I would be soooooo stoked!
Well, the thing everyone flipped out about (and gets wrong about that) was that Thor himself was going to actually become a woman. In actuality, Thor Odinson would still be around, he just would not be using the hammer anymore.
The woman in the Thor costume and using his hammer is simply called "Thor" because she's dressed as him, using Mjolnir, and she never provided anything else to call her.
If she's anything like Beta Ray Bill and Thunderstrike/Eric Masterson before her, before long, she'll get her own weapon, identity, and adventures.