If you didn’t pre-order Mad Max, but still want the PS4 theme, it’s now available for free for everyone on the European PlayStation Store.
You can find it here (open the link in an incognito window if you’re logged into a non-European account). As usual, if you aren’t in Europe, you can download it with an European account. Once it’s installed on your PS4, it will work with any account from any region.
At the moment, we don’t know if the availability of the theme is intentional or a mistake, so you may want to download it while you can.
The theme is static, and doesn’t feature custom music or art, but it still has some pretty pictures, as you can see below.