So after about 2 months of waiting, the soundtrack that was promised as a pre-order bonus was finally made available to those who actually pre-ordered (like myself). There is one HUGE problem with it however. Instead of downloading as a group of separate tracks, it downloads as a gigantic 1.1GB "Soundtrack App". This means you can only play the files while being in-game, so it might not be possible to move them over to your computer for uploading to your iPod or whatever.
Hopefully Sony releases a system patch for this sort of thing, but you can finally enjoy it... while on your PS4... and not actually playing the game while you hear it... What a waste