Don't know why this OST is so problematic :(
Note that I don't have ps4 but all I see on PS Store (KZSF related of course) are three skin packs, season pass and the game itself...
Last 'official' word (from Guerilla) was:
there was an unexpected delay with the soundtrack but we're currently working to ensure it will be available in time for the European launch. We apologize for the delay - rest assured it's still coming!
EU launch arrived but people are still asking about the ost on KZSF boards:
Killzone Shadow Fall Pre-Order Bonus - Killzone.com Forums (
http://community.killzone.com/t5/Killzone-Shadow-Fall-PS4/Killzone-Shadow-Fall-Pre-Order-Bonus/td-p/1400190/page/3)