Joss Whedon never said that he "didn't know anything about the character", only that he was never a big fan of the comics themselves, but always liked the character based on her appearances elsewhere. Same way I've never bought a Captain America, Thor or Iron Man comic in my life but know plenty about them based on their appearances elsewhere in the Marvel Universe. Joss Whedon turned in a draft last year, and has since been doing another draft. I'm not sure if he's gonna stay with the project or not, it is possible they are not happy with whatever he's doing. ( not based on quality, but based on it being not commercial enough ) But remember also, there is a precedent for buying scripts that the studio doesn't plan on using; back in 1998, a novice writer named Alex Ford sold his script for Superman: The Man of Steel to Warners. Warners had no real intent on making it, but liked enough things about it they thought they could use in future Superman films, so they just outright bought it. It sounds like what is happening with Wonder Woman. Cheaper to buy it than spend a lot more money later in litigation.