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Relationship to the Twisting Nether Edit
The demons from the Dark Below apparently exist apart from the Burning Legion, who reside in the Twisting Nether. The Dark Below may be another description for the "Twisting Nether", in which case these are demons of a separate faction that live within the same plane of existence. This would explain how player warlocks are able to summon demons that do not serve the Legion.
The "Below" in The Dark Below Edit
This implies a region that is underneath the crust of Azeroth, and not the twisting Nether in outerspace up in the sky. In early conceptions, hell is percieved to be underneath and not up in the sky. This is the source of the great power of the Illidari.
Speculation regarding Warcraft I EditThis section concerns content exclusive to Warcraft: Orcs & Humans (aka Warcraft I).
See: Hell retcon.
Possible fifth World of Warcraft expansion name EditThis section concerns content exclusive to World of Warcraft.
In mid-August 2013, MMO Champion reported that Blizzard trademarked the name "The Dark Below" which could be the name of a new expansion (MMO Champion has a pretty good track record on these things).  However, they appear to have retracted their claim and now think it could be a hoax.
There is evidence that it could be an expansion where the Burning Legion returns. There are many rumors that the Burning Legion is returning, including the fact that in the Warcraft RPG Book (which is completely separate from World of Warcraft and yet still relates to the game and lore somehow), there is a section that calls Fel Energy's "home" and uninhabited demons the Dark Below.
There is also evidence to support that this could be an aquatic expansion, as Ozumat's title is Fiend of The Dark Below.
Likely eliminating Diablo 3 from the running for using the name "The Dark Below", Blizzard launched a minimalist teaser site for Diablo 3 called "Reaper of Souls", and the background image is called d3x_teaser-en-us.jpg.
At BlizzCon 2013 representatives from Blizzard confirmed that The Dark Below as any sort of Blizzard asset was a hoax. They had not issued the trademark filing.