Ghost of Tsushima DIRECTOR'S CUT for PS4 includes: 

• Full game. 
• Iki Island expansion: New story, mini-games, enemy types and more.
• Legends online co-op mode.
• Digital mini art book by Dark Horse. 
• Director's commentary: The creative team sits down with a renowned Japanese historian to look at the world of Ghost of Tsushima and how it compares to the real-life events that inspired it. 
• One Technique Point
• Charm of Hachiman's Favour.
• Hero of Tsushima Skin Set: Golden Mask, Sword Kit, Horse, Saddle.
• Unlock in-game items via story progression.

I also posted the PS5 version here for £10 more