Eoin Colfer is the first of author to be confirmed, as he’s the author of the First Doctor story in the anthology mentioned here.
A sound choice, as the Artemis Fowl adventures and his following up Hitchhiker’s show.
The Guardian interviews him - in the future, apparently.
The story is called “A Big Hand For The Doctor”.
Which makes me think of this bit of surrealist nightmare fuel but it’s probably a coincidence.