Thing is though that we still have no clue what this green meta form is about, and I think the most important fact is that there is NO green Meta icon datamined, so I'd be really cautious with any hopes or expectations about green meta being implemented for us to use. (or NOT being implemented for that matter )
there's nothing that even hints at meta being related to void. void is cold and emotionless, while meta is fueled by rage. just because something is purple doesn't mean it's made of void. high astromancer solarian does a void transformation, and it's completely different from metamorphosis.
in fact, our metamorphosis form was created by kanrethad by copying illidan's transformation which is full of fel energy: http://www.wowpedia.org/images/3/39/IllidanDemonWoW.jpg
I'm not saying fel meta is gonna happen, I'm just saying it makes a LOT of sense for it to happen.
blood elves, lore wise, gained more power than their high elven counter parts, but since the sunwell has been returned, they went back to that, but are still tainted by the corruption.
Now, with green meta, I can see it lore wise, but I also cant see it. Lore wise, since we technically are not demons, but when we morph, we become a hybrid, not a true demon, but a demon none the less. And with our original forms, we are tainted and corrupted, causing our "meta" to be even more tainted and corrupted into a greenish hue. But, then, again, most demons have a nice pallete of colors, even though most eyes are green. But, I really wouldnt know what the reason behind green meta is. I know its cool looking, and im staying demo with green fire.
I like the idea of a green meta form using fel-powered spells.
A demon form being filled with fel energy makes at least as much sense as a demon form filled with shadow energy, if the color of the demon form means anything. And if it doesn't, well, green is still just as valid of a demon color as purple is.
At the very least, the green Meta isn't any less valid than the purple one.
Keep in mind that I have read some of the quest text and what I found out was that we are to find out some of the "demonic origins" of our powers and our minions. As of some of the results, it is proven that the Illidari discipline along with demons like the Observers appear to be free of fel energy. In other words, we are meant to find means to manipulate the Fel, while finding out our more overall identity that has to do with the void and the arcane.
Yes, it IS possible to have a green Meta, but I don't find it appropriate to be in the same package as turning Fire to Fel Fire. After all, the patch notes refered to our FIRE spells turning green.
As for green Meta... I don't think we know enough of what Meta is for it to be adequetly discussed. Are we truly transforming our bodies with Fel, with the post-500 Fury features (horns, claws/aura, wings for DA) truly part of a Warlock's physical body, or are we just being encased in Fel "add-ons" that are fabricated from the excess Fel energies (best example I can think of is in Mass Effect, where you can create floating holographic armor that isn't truly part of your armor, but instead just a "shell" that covers you). I'm not truly convinced that Meta is a true transformation like Druids, but rather a "shell" like body which we fill and enhances Warlocks. And if it is a shell, and therefore artifical, it's made via magic, and if that magic is made from corrupted Fel it would show signs, ie, the Green Meta. Just a thought.
Tainted/Fel Orcs), and I think we know "enough" based on in-universe lore:
Kanrethad taught Warlocks the ability of Metamorphosis, gleaned from Illidan. Demon Hunters actually transform into Demons: "At the pinnacle of evolution, Demon hunters can unleash the demon in them and turn themselves (temporarily) into something more. This is called Metamorphosis.", "Temporarily transform into a demon" (spell tooltip), "Considered shapeshifting, like [Shadowform], and can't be dispelled.", "Demon-form is susceptible to [Turn Evil]", used to be enslaveable ...
Now, some of this is in-game, and some of this is not official canon (although the RPG used to be considered canon). I think that the evidence is strong enough to say we actually turn into Demons. I think the Demonic Construct / Armor idea is a good idea, but I don't see any evidence to support it. If there is any I'd like to see it.
You do actually turn into a Demon, that's beyond dispute insofar as lore is concerned. Insofar as how Fel Energy taints creatures, the official line is 'it effects different creatures differently', hense how Belfs get green eyes, Orcs turn green completely; and other demons seem completely uneffected. That basically allows them to do whatever the hell they want. Green Meta therefore doesn't need an explaination should they decide to implement it, beyond that 'this is what happens when you choose to learn from the Codex and infuse your magic with Fel Energy'.
Has there been any word on how the Fury meter or the post-500 effects (horn, hands glow, DA wings too) change with the codex?
On a side note: Deviant, I believe Xelneth (that great reference of Warlock-kind) said himself that Demonology uses their own inner fury to fuel their spells (compared to Affli using their opponet's misery). Also, squeeing to the KH reference.
According to the RPG,demon hunters gradually develop demonic characteristics as they level up until they're completely considered demonic instead of humanoid. Demonic Ascension, obtained at the tenth level, causes this permanent change and causes them to develop more dramatic demonic traits, such as horns, a tail, cloven hooves, or wings. In the RPG, the nature of these mutations is up to the player.
If Blizzard had the time and inclination, they would probably create unique demon forms for every single race. Orcs would have red skin and be covered in horns and spikes, blood elves would have feathered wings and cracked skin with fel energy pouring out, night elves would gain cloven hooves, horns, and so on.
Since they don't they use generic demon forms. Honestly, color doesn't matter. It's just the color they decided on when they created the model. We've seen demons come in all different shapes, sizes, and colors. Hell, the felblood elves in Sunwell Plateau have skin colors ranging everywhere from red to blue.