Until the game goes live, I never assume when they tell us three that it's true. Maybe the Kraken is the third death but there has been no official screenshots of it that I can find so I can't confirm or deny it. Does that make sense?
I just found more info on the third death:
♦ Death by Running Out of Air – A sim that scuba dives for too long, but does not carefully watch their air supply, could quickly find themselves running out of air, and then quickly coming to an end.
♦ Death by Burning – Sims crossing a fire walking pit can catch on fire.
♦ Eaten by Predator – Sims scuba diving can get attacked and killed by sea life.
Although I will say that death by burning reminds me of the one we already have so I"m hoping it at least has a new ghost color.