I stand with the OP, until someone provides a valid armory link discussing this is pointless. If it did drop then the information about it is out there.
If you believe the answer to my question is "never" then that might be perfectly acceptable to you, but assuming that people would give this up and eventually stop asking the question without getting an answer either way is an assumption that is so ridiculous that it can be summarily dismissed.
At one end, one person has never seen either of these mounts and therefore conclude that they do not exist. This would be highly subjective and in no way meaningful evidence of anything.
At the other end, every single person playing the game has heard this question, and have answered it, giving us a 100% factual evidence as to whether anyone has the mounts or not.
In between these two extremes slide a scale, and we are currently (still) very close to the former end of it. Compared to the whole, few people have asked this question.
At what point on this scale do you believe it becomes more likely that no one has these mounts than the alternative, that someone has them and is either unaware of the question or unwilling to answer it?
And remember, the very moment someone can post an armory link, my entire argument is INSTANTLY AND PERMANENTLY DESTROYED.
Just ask blizzard if it exists and await the official reply!
Anything else is speculation and should be ignored until then.
---------- Post added 2013-02-07 at 09:35 AM ----------
There's two different ways this can conclusively end:
A: A blue post states that no, the mounts have in fact not dropped and there is an error/bug/oversight/whatever that is now on our issues tracker.
B: Someone who has the mount on a live server will serve up irrefutable proof that it exists.
Both of these are acceptable and (scientifically) very welcome outcomes!
(Of course we have also option C: it will be completely ignored by Blizzard and we'll either see a drop eventually because it's silently fixed, or after years and years we'll just accept that these mounts were never in the game. This is not satisfying for anyone and therefore somewhat unlikely.)
The problem that I was arguing against is zealotry - the fact that a large amount of people accept the less likely explanation without reasonable grounds. Conflicted with an increasingly large pile of circumstantial (but fairly solid) evidence they pick at individual claims, disregarding context, and eventually come up with complete speculations that can explain their point of view.
This is something you would do well to consider in any argument as simple as this: There are two sides, both plausible explanations, but only one truth. They both start out on equal grounds but one of these explanations can present evidence after evidence after evidence that all point towards a clear conclusion, while the other explanation stands firm with only the original supposition, and not a single verifiable fact is presented in favor of it. Which explanation is more likely to be true?
You are free to believe your point of view is the right one, but you should be able to recognize when that point of view is based on faith, and not reason.
@Xeraxis, the biggest problem I have with this is not how big a population of the wow players who read this, but how many per realm. Is it 1? 10? 100? If there is just 5 active posters for each faction and realm, someone should have seen this mount and be able to post an armory link.
I'm 100% sure I saw someone riding a black cloud serpent quite a while ago, but only once. May have been from BMAH though. o.O