Arrgh...not only did they blow the sequel (the Beta Ray Bill story arc would have been perfect, considering the direction the Avengers sequel appears to be taking) but now this? Seriously?
Marvel has long defined that Thor’s power is transferrable and it doesn’t have to be male. Wonder Woman was considered worthy to carry his hammer during one of the crossovers.
This is not unprecedented in the least, within the parameters long set by Marvel.
Next on the agenda will probably be making the Invisible Girl into a man.