If they are using BvS to create a larger background threat with Lex Luthor and will use the next Batman film as a tie-in, then I think Freeze is the way to go. He can have Lexcorp ties without needing the whole movie to be entirely about Lex. Freeze has always been a sympathetic villain who needs a push in the wrong direction too. He's also a genius in his own right and can keep Batman on his toes for much of the movie without engaging him directly.
If they are not going to do a tie-in then I think Batman needs A more direct villain, for this Deathstroke could be excellent, though I would prefer if he stayed a shadowy puppet master for some time. If they are going to introduce Robin (as an actual sidekick or compatriot) I think Slade is a good choice since he is an enemy to both.
If it's going to be more stand-alone and without Robin then I think that Hush, the Penguin, or the Riddler are all good options. Hush could again act as the puppet master and easily use less mentally formidable rogues like Firefly or Killer Croc. The Penguin may also be fun to have in his role as a low key gangster who serves as an occasional source of information. The Riddler needs to have a purpose though, something he often lacks in all incarnations.
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