My only suggestion is to use hinting once the card number input is complete to suggest the user then fill out the name and expiration date. Also I think when pressing tab to go to the next input, you should have the order be:

card number -> expiration date -> name

instead of the current order of number, name, date.

It's a really slick implementation, I love the flipping animation, I used an extremely similar animation setup (face front/face back, and a flip property) on a site I built.