I don’t think he said anything about blue eyed in this regard, but fair-skinned, blonde hair, majestic elf… certainly.
But I do believe Ion may slip a little in his interviews in regards to these details in lore.
Personally I would rather see Steve Danuser’s, as the current narrative lead designer, answers to a couple of things in regards to the Blood Elf eye colours.
How did the [blood elven] [fel] eye glint become so widespread? The [Warcraft Encyclopedia] suggests that [Rommath] only taught the blood elves of Azeroth about how to siphon arcane magic, as most of the populace would likely be “horrified” if they knew the true extent of [Kael’s] dealings with [Illidan].
The situation regarding blood elf eyes is, in fact, extremely similar to that of the green skin of [orcs]: just being around heavy use of fel magic turned the eyes of the blood elves green. You could be the most pious of priests or most outdoorsy of [Farstriders], chances are, if you were a [high elf] in [Quel’Thalas] or [Outland] following the [Third War], you were around fel energies, and your eyes would turn green. Like the orcs’ skin color, such an effect would take a very long time to wear off. Fel magic works a bit like radiation in this sense; it permeates the area and seeps into anything in the vicinity. Anything near a source of fel magic shows signs of slight corruption, it just so happens that high elves and orcs manifest it in a very visual way.
Then the chronicles explaination that the Sunwell’s energies now being of Light and Arcane properties.
Then the Creative dev answer to the Blood Knights
The Blood Knights of Silvermoon lack direction. None of them were seen in Northrend, and it is very unclear whether the Order still exists, or if it’s been disbanded. It’s also very unclear where the Blood Knights obtain their power, now. It used to be the Naaru but then… remnants of the naaru. Surely these remnants are all but tapped now. Do we obtain power from the Sunwell?
As of the end of the [Burning Crusade] expansion, [blood elves] who wield the [Light] do so through the power of the renewed [Sunwell]. It is a harmonious relationship, no longer one of discord caused by the blood elves’ attempts to bend the Light to their will, which will likely have a positive effect on blood elf society in the long run. Look forward to updates that reflect this change in the [Silvermoon] and [Blood Knight] quests.
Then his own take on the blood elf golden eyes
It’s not that all blood elf eyes have changed from green to gold. It’s that the potential for golden eyes is present, based in part on the individual’s degree of devotion to the Light.
And
For players, we intentionally didn’t restrict which classes can have golden eyes. Whatever story you want to make for your character’s eye color, more power to you.
For NPCs, we will be selective. Priests & paladins are more likely to have them, but others can if it makes sense.
It stands to reason that the more devoted to the light you are, the more light energy you manifest. In case of High and Blood Elves this logically means that their eyes would shift to a golden hue.
Now we have the Demon Hunters.
Demon Hunters are using arcane tattooes to keep the fel in their bodies in check, because arcane counteracts fel.
Back to the Sunwell being a mixture of Light and Arcane energies.
The High and Blood Elves do not have a on/off switch of what energies that affects them, the energies of the Sunwell passively surges through their bodies unless the elves now have to go and drink from the Sunwell, which is irrelevant because they still can’t choose what energy they wish to take.
The Light cleanses fel, and the arcane counteracts fel. Two energies that overpowers fel are passively surging through the Blood Elves bodies, and if they are devoted to the light and manifests a whole lot of light energy they get golden eyes.
But if they are mages and are continueally manifesting a whole lot of arcane energy whilst their body is being cleansed by light… it seems logical that their eyes would turn blue.
We know from Mists of Pandaria that the green crystals are implied to have been removed, or at the very least are not used in a similar manner as they have in the past which was trapping demon souls.
So unless they are warlocks, there is nothing preventing the rest from quickly losing the greenish hue.
I would absolutely love to see Steve Danuser’s answer to this, rather than Ion’s.