There have been talks about who the main villain of Superman is going to be in “Man of Steel 2” and the consensus of the rumors has been fairly consistent in saying that it is going to be Brainiac.
Brainiac is one of Superman’s greatest villains, perhaps second only to Lex Luthor.
During the marketing for the DC superhero ensemble movie, it included a mock website for Lex Corp, the company owned by Lex Luthor. The site detailed the launch of Lex/OS, which is a type of computer operating system that has gained a sentient conscience.
It is rumored that Brainiac may evolve to be the physical form of that sentient conscience the same way that Vision from the Marvel Cinematic Universe evolved from Jarvis, the computer system being used by Tony Stark.
But Brainiac in the DC comic books is quite different. He is a super-android who claims to be the most intelligent being in the universe.
The character is often tied with the Kryptonians and their history. In fact, in the original Superman comic books, Brainiac shrunk the Kryptonian city of Kandor and kept it in his spaceship as part of his collection.
In other words, Brainiac in the comic books is an alien being just like Superman is. But in the rumored plotline for the DCEU, Warner Bros appears intent on humanizing him to make the villain more palatable and grounded.