Vin Diesel is on board to produce and star in an untitled action/thriller project from Unknown screenwriters Oliver Butcher and Stephen Cornwell. Details regarding the untitled project are sparse, but I'll go on record as predicting you can probably expect a car chase or two somewhere along the way. Variety reports that Diesel and partner Samantha Vincent will co-produce the film through their One Race Prods. moniker alongside Simon Cornwell and Rhodri Thomas of Ink Factory.In addition to this most recent project, Diesel is also poised to begin production on the next Riddick film this September in Canada. He is also attached to pull producer/star duty in the MGM action/comedy The Machine. As for Butcher and Cornwell, the writing team is currently working on an adaptation of the Warren Ellis graphic novel Gravel for Legendary. Lastly, regardless of how you feel about either Diesel or Butcher and Cornwell's Unknown, you can't argue with the type of international success each has had at the box office. Both Fast Five and Unknown earned more in foreign markets than in their domestic counterpart. Look for this most recent project to be packaged with that type of international success in mind as well.