I dunno, with the removal of blackout and the change to fear and the increased cooldown on Psychic Horror, is there any reason to even PvP on a shadow priest? Battlegrounds are ok while you're not getting focused but forget about arenas. Heck, even now arenas are a joke on a shadow priest. We get to tank for 15-20 seconds, then we get to watch. The only positive change is that Dispersion will remove crippling poison and make you immune for the 6 seconds that you try to get away without being able to heal or cast defensively (ie fear or psychic horror).