Director Barry Sonnenfeld has been a wee bit coy about what he'll be doing after Men in Black 3, but it seems like, unless you're J.J. Abrams, secrets in Hollywood don't stay secret for long.
According to Vulture, Sonnenfeld is hitching his wagon to The Metal Men. Created back in 1962 by writer Robert Kanigher and artist Ross Andru, the Metal Men were a team of cyborgs invented by Dr. Will Magnus, each of which is made from and named after an element: Gold, the team leader; Iron, who was super-strong; Lead, none-too-smart but super-loyal; Mercury, the hothead; and Platinum, who was convinced she was a real woman ... and was in love with Dr. Magnus.
The Metal Men have been kicking around the DC Universe for decades, sometimes as the stars of their own book, other times as players in stories like Kingdom Come and Infinite Crisis. They even made a couple of appearances in the animated series Batman: The Brave and the Bold:
What Sonnenfeld will do with them is anyone's guess, but, honestly, I could do with some more superheroic robots on the silver screen.