If I had to guess, I'd say Bendis is gonna spread the love on the Legion stuff between the Superman book and likely Young Justice. I'm just about sure that the Legion will be coming to Wonder Comics. They've had a very shaky foothold when it comes any umbrella to be under (or creating there own), so Wonder Comics seems to be the remedy for that. It's also worth noting that it would continue Bendis trend of having Superman somehow linked to each comic in Wonder Comics even if it's in the smallest of ways. With that track record it's more than likely that we'll be seeing a Legion heavily inspired by Superman.
It also seems like he's 100% going for them as DC's X-Men in terms of fan base and absurdly large amount of characters. That, along with how very interested Bendis is in creating new characters along with brining back old ones in this line, and the fact that Bendis doesn't flat out say that the whole line is just about children or even teen, but rather young people, has me believing in some of my theories for the team and how they'll interact with the DCU.
Good stuff to hear all around.