Driven hasn't started shooting quiet yet... But Refn has told reporters he plans to get Driver a Lex Luthor in the sequel, a threat to him, a bad guy to him.
The plot will be written when the movie has been released. Although, if the plot follows the book, some may be revealed. Driver may be hijacked by two thugs nine years after the events of Drive, killing his wife, then try and find the people that did it with help from a man named Felix, and maybe one of the thugs - or the boss behind the hijack - will be Driver's "Lex Luthor." But it is unknown...