Here’s a quick drive-by for the evening: Bleeding Cool says they’ve heard that Episode VII’s female lead has been cast, and she’ll be “the big news” regarding casting, “though folk might not realise it until after they see the film.” This is tacked on in their item about Jack Reynor, though, so take it as you will.
Whatever the case, as Making Star Wars points out, things do have to be motion fairly soon if they’re going to start shooting in May. It’s a good bet the whos are already picked or close to it: The only thing really in question is when they’re going to (or can) share the news with us.