leprechauns guide to the galaxy

Cool! Eoin Colfer of Artemis Fowl (Die Hard with Fairies) fame has been asked by Douglas Adam's widow to write a sixth Hitchhikers Guide to the Galaxy book, as Douglas had always intended the series to have a sixth instalment. I know we've had James Bond and Gone With the Wind continued over the years. Who else would you get to continue writing someone elses series?