I'm currently worried about the design behind poisons. Previously, it was more like alchemy; the rogue would acquire the materials (whether through vendor/herbalism) and had a bit more depth to the skill. I understand why it was removed - it was tedious and unnecessary. Now, we've got a very simplified version. Each poison has one rank that scales with level.
At the maximum level, the cost incurred to purchase a poison is insignificant. With the inclusion of a thrown weapon, I find myself consuming a very large amount of poisons. This, in addition to the relatively short duration, makes me wonder why we have to constantly re-apply them over and over again. It's a very crucial part of our class, yet it's by far the least interesting.
Why not change poisons to an infinite duration like an aura? I know this is kind of a slippery slope argument, but we've already descended the slide.