Well I think I found indications that A-N will be its own standalone area.
Behind the Titan Relic in Wintergrasp Fortress there used to be a gate with a portal. In the current build, there is a Green portal and no gate. Moving through the portal at this time does not currently place you inside an instance. Currently, moving too deep inside the area zones you into Icecrown which ports you out, but this area would exist 'under' Icecrown.

There are environmental indications that this may be A-N city, and the main or only access into is by controlling
Wintergrasp at the time.

Risenadmin Gallery, Risenadmin Image Gallery - FileFront.com

Hey, all I'm back after that stupid hurricane kept me offline(And without power) for a week! *Shakes fist @ Gustav*

There seems to be a quest line in Icecrown where you spend a considerable amount of time trying to save the life of a Paladin who is being gripped by the Plague of Undeath.

Time Yet Remains - Quest - World of Warcraft -> Hope Yet Remains - Quest - World of Warcraft

After this part I'm not sure if it continues or not.

One of the more interesting parts was that even Alexstrasza cannot do anything to help a body gripped by the plague of Undeath. I'm wondering if there is any chance of salvation for said Paladin(And a cure to Undeath? O_o) or if this is just an incomplete(Or perhaps A'dal is a fitting conclusion) to the quest line.

Well, according to wiki,

That is from the Lands of Mystery book.

I don't know how much this bothers anyone else, but is anyone else a little bit... confused by the idea that there's some "ancient" spell that cures Undeath... when it's a fairly recent phenomenon on Azeroth? Or at least, at this large scale? What does that suggest?

Nothing specific really. WoW lore spans tens of thousands of years, but there are some massive gaps in there, both in timeframe and location.

If I recall correctly, Rhonin together with Broxigar and Jarod Shadowsong encounters Nathrezim experimenting with necromancy in the ruins of Suramar. They kill the Nathrezim, but it appears the undead they created remained, and were likely the undead Rhonin and Krasus encountered on their journey to Kalimdor.

For all that matters, the spell might not even be native from Azeroth which might explain by Malygos might not be able to know it. Paladin spells suggest that the light could be used to turn undead, it might be a Naaru work that it is able to manifest its power and mass destroy undead.

Also , I do not believe it actually "cures" undead as in make the undead living again, so putting it to permanent rest will count as the cure, which reminds me of Ashbringer. The Ashbringer also have the power to slew undead at ease, Morgaine killed thousands of undead before falling to exhaustion.

It is hence not unreasonable to believe such a power can be written into a spell. The caster would need to be extremely powerful to use the spell in the case.

Although the Undead appeared in the War of the ancients Trilogy, their appearance is rather brief, and quite unsignificant in the story line. Also not many elves have contact with them, Krasus is the only probable guy who could write such a spell but it seems unlikely in this case as the Dragonqueen could not cure it.

Well, if such a spell does exist, and assuming Blizzard wants to fit it into the WoW lore at this point (Blizzard can just say no nothing like this exists and they don't have to deal with it), I would think Arthas would be making efforts to get his hands on the spell.

As of now, there is nothing to suggest he is. But then again, I have always been in favor of Arthas raising Malygos as a Forst Wyrm after we slay him.

Has there ever been any indication that the source books are pure, 100% canon? Keep in mind that the audience for these books is tabletop dungeon masters searching for adventure hooks for their parties. The authors of the books can hint at things like spells that cure all undeath everywhere because if the players of a tabletop game ascend to god-mode and save all of Azeroth, no one cares but them; it doesn't impact the greater lore.

I don't think there is such a thing as 100% canon. Lore from pretty much every possible source has been rewritten at some point, in some cases multiple times.

Anyhow, I made a new post over on wotlkwiki, I'll crosspost it here if anyone has any thoughts:

At a few points Loken comments that his work represents an attempt to revive/free a "Father" of some sort. Presumed Father is in Ulduar, I believe, probably the Ulduar raid.

On the other hand, when you actually engage him in Halls of Lightning, he mentions that he's working to release Yogg-Saron onto the world. Which would presumably mean that Yogg-Saron is this "Father", except:

a) Old Gods aren't exactly "Father"-like figures, are they?
b) Yogg-Saron certainly isn't in Ulduar and probably isn't even buried beneath Storm Peaks, so why are they working there?
c) If Yogg-Saron is the "Father", and he isn't in Ulduar, wtf is going to be in the Ulduar raid? Completely unrelated lore stuff? Alternatively, if Yogg-Saron is the "Father" and in the Ulduar raid, wtf is going to be in the Azjol-Nerub raid, where I think everyone has presumed Yogg-Saron will be?

The main question, ultimately, is whether Yogg-Saron is the "Father" figure to which Loken refers, or whether he's trying to help someone/something else that will ultimately help Yogg-Saron out. I find this to be the most likely explanation, but it's still unconvincing.