In what feels like an early April Fools joke, a follow up to Ivan Reitman's 1988 comedy Twins, starring Arnold Schwarzenegger and Danny DeVito as experimentally conceived brothers Julius and Vincent, is in the works, that would have the pair discover they have another sibling, to be played by Eddie Murphy........Yeah. My reaction too.
There is no director at this stage, but the stars have signed on, Reitman will return as producer, and the search is currently on for writers to develop the idea.
Source: The Hollywood Reporter