Sorry to burst your bubble, but they changed Shiv so that it applies all poisons. And that will be the normal version of the poisons, not the weaker version Deadly Brew gave us Rogues. In other words, Shiv will apply a 25% MS when we had a 15% MS in 8.0.1. And because we lose Deadly Brew we will have a honor talent free to pick Shiv. Convenient.
So the removal of Deadly Brew will cause two things : first we’ll need to MANUALLY apply and reapply our MS effect, and second, the MS effect will be stronger than before.
You will only have some relief 4 secs every 12s, because Shiv has a 12s CD, and I think all poisons but Deadly last only 8. It would be a shame if you were to get into a Kidney and receive no heals during those 4s !
The only thing you can see as good for you is that from now on Rogues won’t be able to apply their MS on two different targets. Their kill target though, will be savagely destroyed.
Oh and, if that change to Shiv sticks, people will start to use Master Poisoner again for an ever greater MS effect !
Best wishes !