Sat this in my twitter feed from DE Megan . . .

PS4: (PJAA-CDN?-98L8) The missing letter is also the coldest Warframe. Limited to one user- redeem to win!

Codes can be redeemed in the PlayStation Store on the PS4 by doing the following:

1. From the PS4 XMB (Dashboard) select “PlayStation Store”

2. Once in the Store scroll down the menu on the left hand side of the screen to the very bottom and select “Redeem Code”

3. Enter the 12 digit code and confirm

4. Next time you boot up Warframe you’ll be awarded the Platinum/Platinum Mods (depending on the pack)