Well maybe not, but that was a rumor about a year ago when it was reported they were remaking "Masters of the Universe". Ironically, its Ms. Garner's 34th birthday today!
While she is not my personal "fantasy image" of a superheroine, she has the resume, talent, and looks to defintely pull off such a role. Hollywood, please take note! (well, you did with Elektra, but I mean with something GOOD)