Unfortunately, according to Wikipedia, David has been approached several times by Universal to authorize a Director’s Cut of the film, but he has declined each time.
From the looks of things, the Third Stage Edition is going to be as close to a Director’s Cut as we are going to get.
I can only hope that after Lynch passes on, the rights of the film will transfer to his estate or another holder and then they will authorize a Director’s Cut to be released on DVD and BluRay.