This may be a bit of shock to fans but Deadline has posted a press release from Warner Bros that confirms Jessie Eisenberg is to be Lex Luthor in the upcoming Batman vs. Superman movie. It also confirms Jeremy Irons will play Alfred, Batman's butler. On the announcement Zach Snyder said,
Lex Luthor is often considered the most notorious of Superman’s rivals, his unsavory reputation preceding him since 1940. What’s great about Lex is that he exists beyond the confines of the stereotypical nefarious villain. He’s a complicated and sophisticated character whose intellect, wealth and prominence position him as one of the few mortals able to challenge the incredible might of Superman. Having Jesse in the role allows us to explore that interesting dynamic, and also take the character in some new and unexpected directions.
As everyone knows, Alfred is Bruce Wayne’s most trusted friend, ally and mentor, a noble guardian and father figure. He is an absolutely critical element in the intricate infrastructure that allows Bruce Wayne to transform himself into Batman. It is an honor to have such an amazingly seasoned and gifted actor as Jeremy taking on the important role of the man who mentors and guides the guarded and nearly impervious facade that encapsulates Bruce Wayne.
Also starring is Henry Cavill reprising his role as Superman, Ben Affleck as Batman, and Gal Gadot as Wonder Woman. It's currently being written by Chris Terrio, from a screenplay by David S. Goyer. 'Batman vs. Superman' is due to open worldwide on May 6, 2016.