I'm not sure that Miss Witherspoon has even been asked to do the job let alone accepted it.
This seems like a fantasy wish list of people to portray ME in MY film about ME.
This all, of course, depends on whether she can screw the money out of Macca to pay for it (films don't come cheap) and also whether this is just another front in the battle being opened to ensure maximum publicity for her side (and I suspect it is).