I have already /bug reported these.
But this thread might be helpful to share to others and for others to share.
1. Envenom gets dispelled immediately and does not take effect.
2. Noxious Assault does not proc the poisons on the weapon. (I also do not think it applies the attk power either, it seems to always only deliver a flat 30 dmg)
3. Surprise Attack never procs.
4. Relentless Strikes seems to provide a fire totem power increase buff instead of a finishing moves damage buff.