There will be both single player and multiplayer
It's been confirmed that Skull & Bones will have both single and multiplayer elements.
Is Skull and Bones PvP?
Heavily inspired by its work creating the naval battles for Assassin's Creed: Black Flag, Skull & Bones was set to expand the concept into a full game with customisable ships, PvP multiplayer battles and a large ocean to explore either alone or with friends.
Will Skull and Bones have land gameplay?
While Skull and Bones' map will largely consist of open sea, it will include land-based locations including a fictional pirate haven in Madagascar and the Coast of Azania (modern-day Mozambique).