The selection criteria were innovation, contribution to theory and practice, impact and readability. At the EURAM conference on 16 June, it will soon be announced whether one or both of the finalists will receive the prize money - but the nomination is already a great acknowledgement of the scholars' work.
You can purchase or download the book for free from DeGruyter. The Gamification Design Pattern Cards (and other materials) are now available as a free download at UXBerlin.