There isn't much information floating out there about this game other than some footage showing off some gameplay. But the few things we can garner from the footage shows that we can expect naval battles from a first/third person perspective.
Assassin's Creed: Black Flag showed that gamers can appreciate naval battles when done right, so any game that's willing to explore that vein even further is surely one to look out for.
One thing in particular I hope is true is that this is an MMORPG. There is no concrete information out there confirming this yet but if the clues are to be believed, you can sail off into the sunset in a pirate ship with your friends and plunder the high seas.
Sea of Thieves is set to release some time this year on Xbox One and Windows 10.