First of all, I like the changes, as they seem to balance out some of the more overpowered abilites (warlocks, not commenting on other classes, although some of their stuff looks really cool) such as Spell Drain, our bubble mechanic, etc. I am also quite happy to see Wild Imps as not cut :)
I do have some questions about the Dark Soul Passive effects. The new proposed Dark Soul looks really good, but if the passive effects are disabled while the ability is on cooldown, what is their point? Are these abilites not supposed to be used on cooldown? With the current Demon Soul design, you might save the demo or aff one when it could be of better use, like a Drain Soul or Soul Fire phase (not as much with the current Demo Demon Soul), but with Dark Soul offering very powerful passive stat buffs, it seems as though they would be used all of the time, except for perhaps the demonology one, which could just be timed to use with Guardians.
Perhaps Im misunderstanding the wording or the way these abilites are supposed to work. Any constructive clarification, blue or not, would be greatly appreciated :)
Keep up the good work. Very excited for MoP!