First : I'm french so I apologize for my bad english :-X
I was thinking about something recently...
After seeing the new soulfire ability for Warlocks (Decimation = 60% less cast time on SoulFire after casting Shadow Bolt on targets below 35% health), I wondered if we (Shadow priests) could have approximatively the same thing in the shadow tree.
Let me explain, this new Soulfire can be considered as an execute (Great damage and the 35% health penalty)
And we know that Warlocks and SP have a lot in common when it's about ups. (CF : crit on dots, haste on dots, etc).
So why for once couldn't we get the same ?
Adding a similar talent in the Shadow tree wouldn't be so OP.
Example :
Death Sentence : When your target is below 35% health, your SW : Death damage is increased by 100% and the damage return penalty is cancelled.