they are following a leaked list released just before TBC:
Code:
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+++