I ordered that in the PSN on the PS4 and I did not get a pre-order code.

I received a confirmation email and got charged right away, but no code for MogStation.

I also use FFXIV on my Mac when I have spare time at work, so I had to pre-order that as well. That one provided an email with a code that I used to get another code for MogStation. Of course, that will get me the extra items, but it still doesn't show the PS4 version of Stormblood in MogStation as it does already for the PS4 versions of ARR and HW.