The image accompanying the tweet,

Which looks more like a team up of sorts so I’m guessing… Brainiac?

We’re also definitely heading towards Conner Kent. Lex tries to copy Superman, but that ultimately fails because he isn’t smart enough. Next he’ll try to become Superman, but that will ultimately fail because he isn’t strong enough. Finally he’ll try to create Superman giving us Conner. And if we haven’t introduced Bizzaro by then, then that’s the film where it happens.