If you consider the "rules" of the Null numbers, I don't think it's actually Gone Girl, because that was released solely by Columbia, Nullco wasn't involved at all. I've seen other people speculate that Null 03 might be Juno instead, because that was released by Nullco (The Null Corporation II specifically).
But it's all arbitrary unless Trent, by some miracle, decides to announce it. You could probably assume either one.