Actor Jason Flemyng was attending the UK premiere of 7 Psychopaths where he answered some questions and unintentionally or not let slip what will be the next project of his friend Matthew Vaughn.
Here's Jason's interview.
This rumor definitely deserves mentioning because indeed Jason and Matthew are close friends and they did 9 movies together so knowing of his next project does make sense. And he definitely looked confused when he let slip the info.
We can add this rumor of Matthew Vaughn directing Star Wars to the Collider theory of a few days ago.
Personally I think that a Star Wars movie written by Michael Arndt and directed by Matthew Vaughn is maybe the best combination. Hope this is true.