Kinberg, who is penning a script for the film in collaboration with helmer Matthew Vaughn, hinted that Michael Fassbender's villain will be taking centre stage in the follow-up.
"Magneto becomes the villain ultimately of the franchise but he's a much more complicated character as a young man. He's someone you sympathise with, you care about you root for even though might not necessarily agree with his methods, you understand his philosophy," Kinberg told MTV News.
The scribe went on to say that audiences will be "afraid" of Magneto in the sequel, but he will not be a "full-on" villain.
"I think the truth is ultimately that because Michael is such an interesting actor, he'll never be full-on anything. He'll have a villainous side and he'll have a sympathetic human side you'll be able to relate to but you'll also be afraid of him. He becomes Magneto, he says 'Call me Magneto' at the end of the first movie."
X-Men: First Class was released in cinemas in May last year. Vaughn signed on to direct the follow-up in January.
Watch X-Men: First Class star Jason Flemyng discuss the sequel with Digital Spy below: