It may not be cutting edge for game designers, but it is desperately needed for teachers! I read "Theory of Fun", "Program or be Programmed" by Rushkoff and "Reality is Broken" by McGonigal all the same summer and they changed the way I teach. There is a definite psychology to the way our brains process and retain information and skills. Games and projects and movement and music and art all make those natural biological processes fire in ways that sitting at a desk writing a worksheet never will.
Glad to see a 10th anniversary edition, and just waiting for it to be added to teacher education classes.