I could be wrong, but it appears that the build/tree that is getting crushed with this update is AA.
Keep in mind that the conclusions I'm drawing here are based on AA primarily being CC and instakills as opposed to the ongoing damage of say a DWS, elemental arrows notwithstanding. Here is a list of the items being ding'd in the AA tree by the changes along with brief explanations.

1 and 2:
Starting with the doubleshot nerf in the cores, In AA style the number of hits is of the upmost import as you want to proc vorpal, crits, and stack effects of your arrows and generate SP. With that being the case the change to mechanic s of Double shot has a large adverse impact on AA that it doesn't have on other bow builds. Going beyond just the bumps to shots you used to get with the cores +25% overall increases to double shot will mean larger single-shot damage multipliers to others in the case of AA it means the possibility to trigger the abilities you spent all you AP on is at best halved and at worst reduced by 3/4. Replaces loss with nothing.
3:
Mild buff, in that being able to hit will be a lot more important with the doubleshot changes because missing once means missing all. So the +hit of the AA tree will be more important.
4:
Dispel shot, the nerfed doubleshot chances to strip deathblock and other mob buffs means that you will have to buy three ranks and hope for the best. Replaces with nothing other than slight damage buff.
5:
Inferno, with the nerfed doublshot and the 3 second cooldown it's impossible to get any decent stacks built up as they expired. Replaces with mild Damage increase.
6:
Shattermantle, Nerfed stacks and vastly reduces chances for vorpal procs. Replaces with nothing.
7:
Terror Arrows, This is huge. Nerfed chances for Vorpal PK. Makes a hard to justify build absolutely fucked now. Replaces with nothing.
8:
Soul Magic, doublshot nerf reduces the SP generation, that 15% chance won't do shit now. Replaces with nothing.
9:
Banish, nerfs both the Vorpal effect chances and guts the rate you can stack pull of reality. And replaces it with nothing.
10:
Smite, nerfs the Vorpal chances and replaces itwith nothing.
11: Possible mechanical increase to damage... if you hit.
12: Custom increase to damage, especially multi-class builds.
13: nerfs stacks and ongoing effects.
Really the changes will reduce the AA tree to secondary damage tree as opposed to anything moderately unique. Not the end of the world, but I definitely didn't get the impression that Lynnabel had a clue about what it would really be doing. Don't get me wrong, I love damage, but if I want damage I wouldn't be using the AA the way half of it was designed in the first place.