Rare announced that crossplay can be turned on and off when entering PvP in Sea of Thieves. But console players who play with mouse and keyboard will matched with PC players.
Rare announced that Sea of Thieves is getting an update which will cut the game size in half. But you have to reinstall the game.
On Xbox One, the game will shrink from 35GB to 10GB, and 47GB to 25GB on Xbox One X, PC will go from 47GB to 27GB.
The update will arrive on February 6th on all platform.
Cursed Sails and Forsaken Shores will release at July, September 2018 each.