Is Vin Diesel Directing Fast and Furious Prequel?

Vin Diesel has told comingsoon.net that he will be directing a 20-minute prequel to "Fast and Furious", the fourth film in the Universal franchise. 

The prequel will star Michelle Rodriguez and Sung Han, both reprising their roles.  Diesel will also star in the film.  

The film is said to possibly tie in some events from the second and third films.  "Fast and Furious" is said to be a sequel of the first installment, not of the second or third films. 

"Fast and Furious" will reunite Diesel with co-star Paul Walker.  The film is scheduled to be released on June 5, 2009.