Millar tweeted the following:
Just off the phone with Fox and some excellent news - Matthew Vaughn is producing Josh Trank's Fantastic Four reboot!
Millar and Vaughn have a history together as they worked on Kick-Ass and Kick-Ass 2 as well as Millar's upcoming The Secret Service.
Matthew Vaughn is also attached to Fox Studios and Bryan Singer's X-Men: Days of Future Past as a producer.
No details on the Fantastic Four reboot are known other than a March 6, 2015 release date.
Vaughn was also said to be in contention at one time to direct the new Star Wars.