I do understand the nostalgia of the old animations, even if they are around 10 years old at this point. But if you were adding three new actions with the new expansion, would you really want to see Scourge re-implemented as a stand-alone 60s recast Sonic Break/Goring Blade equivalent? Scourge itself existed at a time when single target DoTs interrupted your combo and your combo length itself was variable (due to Blood Weapon's haste effect). You can't take it out of that context and expect it to have the same effect on gameplay.

Any 'upgrade' to Dark Mind is going to come with a fairly substantial nerf in its recast. It's the same as with TBN. Just leave sleeping dragons lie.

Blood Price is probably the most interesting effect out of the ones discussed. I could see a 'Dread Spikes' type ability being added where you can heal back a portion of damage dealt to you. I don't think you could directly copy FFXI's version, but it may be case of 'heal back X% of the damage dealt to you in the past Y seconds'.

DRK does need more GCD actions, though. I'm hoping that they add on a combo action that follows Bloodspiller, because that by extension will influence Delirium as well. It would also be nice to see some form of burst finisher (Level 100 seems like the best time to bring out Omnislash and Lionheart). And all tanks could do with a second look at their mobility tools. Melee is miles ahead at this point.