Two weeks ago, I asked you to throw out everything you knew about rogue poisons. I was being silly, because I know that would be a lot to ask. Many of us have spent years learning the intricacies of the poison system, studying PPM charts and evaluating our options. Unfortunately, it looks like there was actually no hyperbole in my original request. With the latest round of info we've received, every single poison mechanic in the game will be overhauled in Mists of Pandaria.
We already know about the new lethal/non-lethal designations and how we'll be able to have two poisons on both of our weapons at all times. We already know that poisons will be critting for double damage in Mists and that their crit chance will be calculated based on our melee crit rate. These improvements are just what we needed to increase our utility options and to boost crit's viability as a secondary stat. In addition to these sweeping changes to poison crit mechanics, we've learned that poison's hit mechanics are also being revamped.