The Xbox One saw the release of Cities: Skylines last week after the game had been exclusively available to PC owners since its initial release in 2015. The Xbox One version of the game includes the base game, as well as the After Dark expansion – but not the Snowfall or Natural Disasters expansions.
Now, it looks like t the game will be making the jump to PlayStation 4! The Brazilian (Gematsu) game classification board has rated Cities: Skylines for the PS4, which suggests the jump to PS4. (even though Paradox Interactive hasn't announced it yet).
No release date has been revealed for the PS4 version.