Do not worry, Koopa_Troopa, I'm pretty sure you're receiving your pre-order code on time. Just be sure to check your e-mail out (inbox and spam folders) from time to time.
I know official webpage states the number of pre-order codes is limited, and distribution will cease when the limit has been reached, but there were not so many problems (if any at all) before with PC and PS3 versions, so I guess PS4 will be just fine.
Please, keep us informed!