PvE-wise, it's a noticeable buff for mutilate. A fellow rogue was talking to me right before raid about reading a post on EJ about dual IP + Evis(with the glyph of course) possibly outdamage IP-Deadly-Env. So I tried both on a few different encounters.
- Dual IP + Evis:
Funnily enough, after checking recount, Instant poison did more damage than mutilate did...no, I'm not joking. IP was around 25% of my overall damage. Tested on 3 fights, average dps - 3700.
- IP/Deadly + Envenom:
Also tested on 3 fights, average dps - 4100. Now, I didn't change my spec up from prepatch muti, so I might mess around with that next tuesday.
Other rogue went combat last night, using KT's reach/Webbed Death, and averaged about 100 dps higher than me on most fights.