Just glancing through it, it looks like the 2nd edition uses p5.js instead of Processing, and there's an additional chapter entitled "Neuroevolution."

Chapter 6 is also revamped (to use matter.js) and other chapters include expanded / revised examples and explanations. Chapter 10 was almost entirely re-written, Chapter 11 is new.

Thanks Dan! The first edition of your book sits on my desk for inspiration and has become a creative reference for me. It was actually a nice exercise to convert everything to p5js for me. Thanks for keeping us informed and entertained over the years!