I say pair him up. I REALLY want the next film to be a true sequel, and then have Luthor be the puppet master behind Metallo. Once Luthor is exposed, he can then go rouge and join forces with Brainiac, who turns out to be a bigger villain.
Batman can then try to stop Luthor on Earth, while advising Superman in space on the data he might know in order to stop Brainiac.
So yeah, I guess I want MOS2 (that happens to feature Batman) then a W/F movie.
But if they do W/F first, I want DC to do WW next. And the solo Superman sequel should go into the relationships between ALL the characters, primarily Clark and the world around him. The villain should be a supporting character, and not dominate the plot.
And after that, they should do a Justice League. I really want a WW before a JL film, though.
So yeah, MOS2,Superman/Batman, WW,JL.
Or Superman/Batman,WW,MOS2, JL
Something like that. Because if we were to wait until five or so characters got off the ground we'd NEVER have a JL movie anytime soon.