An Infinity Ward developer Lee Ross replied to a fan on Twitter stating that the first DLC for Infinite Warfare will be available on January 31st.
He states that it will be available first on PS4 and PS Pro. Which is more or less the same thing.
@ThefirstwolfZ January 31st, first on PlayStation 4 and PlayStation Pro!
— IW Lee Ross (@IW_Lee_Ross) November 29, 2016