While I have mixed feelings about the combat system, level grinding is going to be interesting. As someone pointed out, (and I agree), my biggest concern isn't so much the healing or leveling changes, it's the environmental ones. I have a feeling it's going to take a lot of reloading to make sure I don't under-farm or over-farm an area. It's also going to be an interesting experience the first time I take a wrong turn as a low level character and get smacked across the zone by something several levels higher than me.
This does make me wish to ask: Will be player get a little warning if they are going the wrong way? If, say, I'm level 7 and I can see mobs ahead that might be far too powerful for me (though not close enough to aggro them,) will I be able to at least mouse over their name or something so I can see "Oh, that name's in bright red. I might not want to go that way." ?
I don't want hand holding, since I find the first game over due to the wrong path in several RPGs funny to me. I have to chuckle at myself every time I go, "Hey, where's this leading? <SPLAT BY SOMETHING BIG AND UGLY>"
However, will there be some sort of system to tell you approximately the mob's level in relation to your own? Like with most MMOs:
Grey: Far under PC level, not worth any exp
Blue or Green: Under PC level, with only minor exp
Yellow: PC level
Orange: Just above PC level
Red: Try it and you're toast.
There are potentially many ways that they could give you a quick heads up, on enemies ahead (change in music and background noises), and just like in other games, once the enemy spots you, there is still a moment before a charge actually occurs. Once they do notice you, their health bar pops up (as one example), or a lvl # (though I personally prefer the hp bar for some reason...different strokes). In games that I have played that are like this (and just as DA:I, don't have level scaling), there is generally enough time to still high-tail it out of the area, or some place to hide.
Now granted, that doesn't mean you couldn't still get in trouble. I have been off my game before, and got smacked before I had a chance to run. Most of those times, though I took damage, the enemy(ies) didn't do enough that I couldn't get out. However, there have been a few times that "they got me!" LOL! In games where I can save whenever I choose, I just try and remember to save before entering a new area, and after any big encounter. That often eases my tension enough, but YMMV.

I admit I am looking forward to these new gameplay elements. (oh, and I don't play on high difficulty in any game.

)