Just as a point of reference, most high level epics aren't replaced by standard green quest rewards, even at 80. Leveling to 80 on beta, the only item I replaced with a green was a trinket, and even that was because I wanted to test it more than it was a particularly clear upgrade. And the trinket I replaced wasn't a high level epic -- it was a Bloodlust Brooch.

In fact, most items I did not replace at all (I didn't do any dungeons, as I wanted to see how long it takes to level strictly through quests), and those items that I did replace were with blues from group quests. If I remember correctly, the only things I replaced with quest rewards were a ring, my crossbow, and a helm (the helm seemed to be a sidegrade, actually). I replaced my cloak with a rep reward, and trinkets with profession items. Although, I think I later replaced one of those trinkets with a blue quest reward, but I am not 100% certain. Keep in mind that not every quest has rewards that are even remotely suitable for hunters.

In short, real replacements for high-level epics don't come until high-level dungeons and 10-man Naxx, so if you have really good gear now, and plan to quest-level and grind, you should anticipate hitting 80 in a lot of the gear you have now.

I can also confirm that when there are two scorpids in the raid, only one stack will stay up, and it seems to be the one that attacks first that gets to keep its stack going. It seems to me that the nerf did go through, however, it only seemed to drop my scorpid's poison damage by about 10% (50/11/0 spec). Scorpid still seems to be the pet of choice for damage, I know i'm not giving mine up any time soon. CitizenSnips lives on!

The chance for ranged attacks to miss a +3 mob is 9%. Focused Aim can reduce this to a 6% miss rate.

At level 70 with no Focused Aim, you need 142 hit rating to be hit capped.
At level 70 with max Focused Aim, you need 95 hit rating to be hit capped.

At level 80 with no Focused Aim, you need 296 hit rating to be hit capped.
At level 80 with max Focused Aim, you need 197 hit rating to be hit capped.

EDIT: Thanks Luminaire

I'm presuming you went viper->build full stack->scorpid stops reapplying->beast, it's not quite clear from your description, but I'll give you the benefit of the doubt on that one...

... in which case, that's a completely new stacking (D|H)oT mechanic, since the normal mechanic is the stack's tick is only recalculated at time of reappliction. I wonder if similar mechanics (lifebloom, seal of veng) do the same now, since I'd have thought they'd have used the same code (I seem to recall the patch that made lifebloom stacking viable requiring a SoV coefficient nerf since they made them both apply the coefficient once per stack rather than entirely on the first stack)