I like this a lot.
It removes most of the reasons I don't like auto-health and mana systems. It does feel weird that there's not gonna be any healing spells, for 'realistic' reasons. I mean, we're in a world of magic, and there should be healing magic. It's customary. In novels as well as games. But if you're gonna have mana, that could be the way.
What will seem to happen now, is that strategic concerns will have to spread out over several fights. Just like in BG and IWD. I like this a lot. It feels much more like role-play and less than clearing a typical videogame level. 'Locking' areas with high level enemies is also something I've asked for. Brilliant.
So far, I'm very happy. ...Now, the combat animations, otoh... But <sigh>, I suppose I'll have to say that if you made the above for me, I can live with that you made the animations for someone else, and just suck it up.