Well. I've been thinking about this. They seem to be going for a very immersive style, of game. Kind of like a simulator. So I think, I can conclude that we'd see our health would not recover over time, but only get worse, unless healed, I'm sure that we'd see two different types of healing, e.g. medical and magical.
How effective and what the cons and pluses of each are, we'll have to wait. It's definitely going to be different though.
But on the topic of healing. What about our injuries? Can we be maimed, lose limbs, suffer bad, injuries or get illnesses or diseases that can impact our character? That'd be interesting.