Disneypins.com is showing the five pins Disney will release May 1 to celebrate the 20th anniversary of Disney's Hollywood Studios (formerly known as Disney-MGM Studios). Each pin features Mickey Mouse clad in a director's outfit. I especially like the top left pin shown above.
Each pin is limited to 1,500 pieces, so I expect they will sell out fairly quickly. Based on the listings for these pins, it appears that they will be available in several places at Disney's Hollywood Studios.