My fear too that WB may think Superman can't work on his own on the big screen. If they did then there would be a stand-alone MOS. You are probably right - if this film does very well Batman will get the credit. Looks like there won't be a Superman trilogy but that Cavill will end his Supes run in two team-up films. Assuming JL follows Batman vs Superman. I dunno if WB will distance the film from MOS. The title will tell us that.