Do they give you a code right away or email it to you? Or do they send the code in the mail?
You immediately get an email with a code and a link. The link takes you to PSN sign in, and then put in the the code which takes you to a Sony page that says something like "congrats on purchasing a PS4, pick one of the 4 games". When you select which game you want, the PSN store adds that game to your account.
HEADS UP - I got an error message after I selected my game (LBP3), saying "please try again". When I tried it again, the code was invalid. But I went to my PSN account and checked purchase history, and sure enough LBP3 was there and I could select to download it to my PS4.
GTA V - $41
Metal Gear Solid V - The Phantom Pain (preorder) $41
Final Fantasy Type 0 HD (preorder) $40
Kingdom Hearts 3 (preorder) $40
Uncharted 4 - A Thief's End (preorder) $43
Tropico 5 (preorder) - $41
Batman: Arkham Night Special Edition (preorder with awesome Batman Statue) - $63
(Not listed on Kinja's blog post) http://www.walmart.com/ip/Batman-Ark...n-PS4/40572761
All at Walmart. Crazy, I guess I'll be preordering MGS and Uncharted.