I think the chaos system from the first dishonored was a stroke of absolute brilliance from the developers. They give the player all these neat powers, gadgets and weapons to murder your way through the whole city.... and then challenge you not to use them. Why? because corvo was never an assassin, he was a bodyguard. His job was to protect people and it was the conspirators who tried to turn him into a killer. So the powers, weapons, etc, were the game tempting the player like corvo was being tempted.
Of course the save/reload system sort of ruined that because you could go on consequence free murder sprees, or reload 500 times if you needed to but still, so many games focus on making the good/evil paths equal (or even making the good path better). It was kind of refreshing to see both the good path be more difficult, and to see a real temptation for the player. I thought it was a very clever touch anyway that I think a lot of people unfortunately missed.
So I hope they at least try and do something similar for dishonored 2, or try some other clever thing and don't just fall back on the standard "press A to donate 5000 gold" v "press B to burn down the orphanage for no reason" style moral system