I just loaded into a game and the kraken was invisible, all i could see was when he was using his abilities. From what i could see though everyone else in the game could see him fine, I loaded in like halfway through. This happened to me before when i loaded in to evacuation mode in the beta, all the hunters where invisible instead of the monster.
I got ragged on for sharing footage of an invisible hunter during the beta, good to know the same sort of circumstances leads to the same result in the full game.
An invisible monster sounds terrifying