Aspect of the Viper is an ability that the developers have been toying with like an indecisive puppy for months now. It's been scrapped and re-written a few times, and I can barely even remember all the iterations it's gone through. Many hunters aren't happy with the current version for PvP. Fortunately for them, neither is Blizzard, so it's getting changed again.
In the new version, half of AotV's regen will work passively - whether you're hitting the opponent or not, you'll get 4% of your max mana every 3 seconds. The other half will remain active, but will work on melee hits as well. This way you'll be regenerating mana whether your target is in melee or at range, and getting at least some mana even if the target is out of LoS.
They're also doing some retuning of exotic pets' specials. The target is for an exotic pet to do 10% more DPS than normal pets. GC says the goal with that is to make exotics seem like a good use of a talent point (along with the 4 bonus pet talent points) without feeling like you have to choice an exotic if you're a BM hunter. I question that a little bit. Let's say a BM hunter gets between 25 and 40% of his DPS from his pet. A 10% boost on that translates to a 2.5 to 4% boost in overall DPS. What hunter is going to skip that just for pet aesthetics? Well, probably the kind that doesn't read articles with numbers in them, I guess. Still, in my book, a damage increase like that is not to be passed up without a good reason.