Sea Of Thieves update 1.4.0 for Xbox One and PCs is now available for download. According to the official Sea Of Thieves 1.4.0 patch notes, the new update introduces Shrouded Spoils, the latest free update with a variety of new features and improvements.
Source: N4G PC Sea Of Thieves Update 1.4.0 Patch Notes (November 28th) for Xbox One