Four names have surfaced for the Star Wars spinoff female lead, which also include Rooney Mara (sister to Kate), Felicity Jones, and Tatiana Maslany.
A reporter for Variety is stating Kate Mara is the fourth.
Nothing is known about the character or even what Edwards' Star Wars spinoff will be about.
Recently, Gary Whitta left as the screenwriter following having worked on the movie for a year; Simon Kinberg is now finishing the script.
Various rumors have stated the Gareth Edwards Star Wars spinoff may be about the Rebels securing the plans to the Death Star with a bunch of bounty hunters involved, while another rumor has said it could be a Han Solo origin story with Aaron Paul as the younger version of Harrison Ford.
The Gareth Edwards Star Wars spinoff is due out December 2016 so as soon as production is set to start, Disney should be releasing official information and making announcements.
Kate Mara has Fantastic Four coming out this August, Ridley Scott's The Martian in November, and assuming Fantastic Four does well enough, Fantastic Four 2 in 2017.