Out promoting Man from U.N.C.L.E., actor Henry Cavill briefly touched on the links from Man of Steel to Batman v Superman: Dawn of Justice. Cavill stated that Man of Steel is not just the lead in for Dawn of Justice but the entire DCEU. "There’s a big plan in place at WB for the whole DC franchise. So, all of this stuff ties in. They’re not thinking from movie to movie, they’re thinking from a big tent pole type thing and each story has its own story, which is attached to the major issue. Yeah, there’s a big plan."
Now, this isn't the first time we've heard that each of the DCEU films are leading up to some larger issue or threat that presumably culminates in the Justice League movie. Is it Darkseid and Apokolips? Or is it Brainiac? With much of the mythology and plot centered around Krypton, it's quite possible that Brainiac will be revealed as the evil mastermind behind Zod, Lex Luthor and whatever threats present themselves in Suicide Squad, Wonder Woman and Aquaman.