The differences are mentioned on the product page, but they're best described in pictures. Simply put, the cards remain largely unchanged, but the box was tweaked and redesigned to look MUCH more like real metal. The differences are subtle until you compare the v1 and v2 boxes side by side - after which it's apparent that the v2's are a healthy improvement. There is one very distinguished mark on the v2's - a small roman numeral II on the back of the box (in the thumb cut out area). See below eye candy!
The second edition printing is very similar to the first, but we made several improvements to the tuck case design to make it look even MORE like real metal.