According to two sources familiar with the plans who asked not to be named because they were not authorized to discuss them, a remake of the 2013 cross-gen PlayStation 3 and Xbox 360 game is still in its earliest stages and will not be complete for at least a few years. A team at Ubisoft Singapore, one of the studios that has led development on the Assassin’s Creed franchise’s evolving ocean tech, will be heavily involved in helping to modernize the Caribbean-based sailing game.
There's a also some tidbits about Skull and Bones:
According to an internal email shared with Kotaku, Singapore studio management is currently forcing all developers on the game to work from the office rather than remotely. It’s also providing onsite breakfast and dinner as a way of “thanking you for your unwavering commitment to our shared vision,” though it will also seemingly encourage staff to stay later and work more hours to ship the closed beta on time for a game that was due out years ago.
More at the link