I'm not gonna verify if this is the final cover or not, but if this is Outkast approved then it almost looks like a reflection of where the group is today. Notice that Andre and Big Boi aren't in the same frame. If the record label wanted to promote the fact that they were “still together” (Nullus) then they would be side by side.
Each member is in the other’s picture, which is a nice touch. Apparently, it plugs into the movie somehow, but we won't find out until August. It’s probably one of the more interesting album covers to drop this year.