Just a few thoughts

Triman

First off, I do like alot of the changes. But, I can't help but feel that not very many of these changes are necessary to make the game more enjoyable and dynamic.
Things that would really make the game more dynamic would be, for example, to remove the Major Brutality buff from Momentum. As it is right now it is borderline stupidity to play a stamina build without using it, which means most stamina builds are forced to use a 2h for at least one of their bars. It's very common that this bar becomes a "buff bar". Is this what you had in mind when creating the secondary weapon slot(s)?
Why not make buffs something that promotes variety and fluidity to the game, instead of forcing cookie cutter builds in a game you so inspiringly pushed as being able to be played "any way you want"?
As an example, you could make Major Brutality a buff that activates when using two different weapon abilities in succession, or when using two stamina abilities that increment in cost, or even when using a stamina ability that uses X% of stamina pool.
One of the most boring parts of your great game is having to first of all sacrifice attacks to slot buffs, and second of all having to keep those buffs up. Why not find a creative way to weave those buffs into actual combat?
Empower could be a buff that activates when using a weapon ability after using a class ability, as another example, which would deter people from "spam builds".
This would remove the tediousness of having to keep buffs as part of a rotation, and promote more creativity with builds. Maybe.
I use a 2h myself on my nightblade, and I'm not saying this because I feel like it should be nerfed. I'm saying this because whenever I think about switching weapons and trying something different, I'm reminded of how necessary Momentum is. Sure, I could use Flying Dagger if I wanted to dual wield weapons, but the fact remains that I am "forced" to use a certain ability to gain Major Brutality.

The other thing I would like to adress is the set bonuses of current/upcoming gear. I've had a look at your new sets, and getting increased spell/weapon-damage for 15 secs after using a potion is not going to make people take of their Hunding's Rage/Law of Julianos armor.
Gaining 9 ultimate over 3 seconds sounds like it could be cool for someone using Evasion or Blur, perhaps a nightblade tank. I still doubt many would choose it over some of the existing sets.
My point is this; when I look at upcoming sets, I want to be inspired into thinking "wow, ok, which one should I choose??!??", not "oh, ok, I guess my Hunding's Rage isn't going anywhere."
One thing you could do is finally introduce jewelry crafting. This would allow for synergizing two sets, and promote more versatility in the game.
Also, at Quakecon 2014 it was specifically mentioned that you wanted people to feel like they could go straight from pve to pvp. What happened to this? Now you have set bonuses that apply specifically to boss enemies and player characters.

These thoughts are not entirely thought through, and I am open to being an idiot. I would very much like to hear other peoples thoughts on this.

And finally I will say thank you for this great game. I have spent many happy hours in this world you made for us.