The future, according to some scientists, will be exactly like the past, only far more expensive.

A fascinating post on Allakhazam's forums claims to detail a years-old PDF, attributed to Blizzard, listing five possible expansion sets, the first two of which have actually manifested -- the Burning Crusade and Wrath of the Lich King. Is this for real?

Draenor Set

Azuremyst Isle - 1 to 10
Bloodmyrk Isle - 10 to 20
Eversong Forest - 1 to 10
Quel'thalas - 10 to 20
Hellfire Peninsula - 58 to 62
Zangarmarsh - 60 to 64
Terokkar Forest - 61 to 65
The Deadlands - 63 to 67
Nagrand - 64 to 68
Blade's Edge Mountains - 66 to 70
Netherstorm - 67 to 70
Shadowmoon Valley - 69 to 70

Northrend Set

Borean Tundra - 67 to 70
Howling Fjord - 67 to 70
Dragonblight - 69 to 72
Grizzly Hills - 70 to 73
Crystalsong Forest - 72 to 75
Zul'drak - 73 to 76
Sholazar Basin - 75 to 79
Storm Peaks - 76 to 80
Icecrown Glacier - 78 to 80

Maelstrom Set

Gilneas - 77 to 80
Grim Batol - 78 to 81
Kul Tiras - 79 to 82
Kezan - 81 to 86
Tel Abim - 83 to 85
Zandalar - 84 to 87
Plunder Isle - 86 to 88
The Broken Isles - 87 to 90
The Maelstrom - 89 to 90

Plane Set

Pandaria - 1 to 10
Hiji - 10 to 20
Wolfenhold - 1 to 10
Xorothian Plains - 10 to 20
The Green Lands - 88 to 91
The Dying Paradise - 91 to 94
The Emerald Nightmare - 94 to 97
The Eye of Ysera - 97 to 100
Deephome - 88 to 91
Skywall - 91 to 94
The Abyssal Maw - 94 to 97
The Firelands - 97 to 100

Legion Set

K'aresh - 96 to 99
Argus Meadowlands - 97 to 100
Mac'Aree - 99 to 100
Maw of Oblivion - 100+
The Burning Citadel - 100+++

The "Deadlands" zone is speculated to be today's Bone Wastes in Terokkar Forest. And note that the "Plane Set," i.e., the Emerald Dream, would introduce Pandaren and Worgen.

Some chat on Elitist Jerks challenges the post. One cynical retort claims that the story of the Draenei is too poorly integrated with WoW's lore to have been planned out. Another points out that it's odd that some expansions would introduce new races, while others would not. Yet another condemns the material as being assembled from companion material like the Warcraft RPG Source Books.

Other opinions have come forth in support of the supposed roadmap, pointing out that Worgen have recently received new animations, that Hero classes could make up for the expansion phases that lack new races.

I admit, I find it doubtful this is real. As Metrosexuelf of the EJ forums points out, "It's no secret that eventually they will have to turn to the Maelstrom/South Seas, Emerald Dream, and possibly the elemental planes for future content." But it's certainly food for thought.