Could this be anything to do with Angela being revealed as Thors older previously unknown sister? Possibly.
Either way it looks like Thor will be deemed unworthy by his hammer which means he must do something to shame his name.
Taken from superherohype.com:
Marvel Comics has revealed this morning that come this October, Thor will no longer be worthy to wield the power of Mjölnir, and instead an all new female Thor will pick up the hammer and take his place as the God of Thunder. The new series, simply titled Thor, will be written by Jason Aaron (Thor: God of Thunder, Original Sin) with art from Russell Dauterman (Cyclops).
“The inscription on Thor’s hammer reads ‘Whosoever holds this hammer, if HE be worthy, shall possess the power of Thor.’ Well it’s time to update that inscription,” Marvel editor Wil Moss said in a statement. “The new Thor continues Marvel’s proud tradition of strong female characters like Captain Marvel, Storm, Black Widow and more. And this new Thor isn’t a temporary female substitute – she’s now the one and only Thor, and she is worthy!”
“This is not She-Thor. This is not Lady Thor. This is not Thorita. This is THOR,” Aaron said. “This is the THOR of the Marvel Universe. But it’s unlike any Thor we’ve ever seen before.”
Check out the cover art and images of the character below. Will you be picking up Thor #1 this fall?