My bed waits me, but I need to do more important suff before sleepin'.
Let's discuss about what will be possible to release as a class or spec concepts. What can still join WoW?
Corruption: debuffing role, Corrupted Presence (purple one) would be cool, focusing on shadow/arcane abilities.
Necromancy: many players see the necromancer concept only possible to fit with the DK. Honestly I think that a DK has already its dark spec as unholy, and by the way there will be no sense about a ranged/caster DK.
Trance or Dream: this would be the Dreamer. There are a lot of stuff related to the Emerald Dreams and would fit perfectly into druids. It may focuses into powerful direct heals intead of hots. I see druids, like priests, the only 2 classes able to have 2 healing specs.
Shadowhunt: from the loved Dark Ranger of Wc3, a spec that improves/grants shadow dots combined with arrows. Quick attacks and evasive defense.
Gunshot: improves pistols and rifles, and adds the cool dual-pistol. Too much out WoW? Remember that Blizzard is going out of Wc3 more and more on every expansion. I personally would find it nice anyway.
Headhunt: it would be a kind of melee hunter, similiar to rogues, with bleeding attacks, but should be revisited all the hunter mechanics because Blizzard removed melee things from the hunter.
Earth: I wouldn't dislike a nature-based dps mage, dealing damage with ground spikes and other brown/green stuff.
Summon: BM hunters improve beasts, Demo locks improve demons, Sum mages improve elementals. Fair enough!
Stormseer: offensive range spellcaster (arcane and nature/frost for many water spells)
Sunflyer: melee/low-range healer. The very quick movements available to Monks, make this class the only possible one (druids also maybe) to host a melee-healing spec. I would really love to see this concept ingame.
Devotion: the so-known shockadin, range spellcaster dps. Exorcism main ability.
Inquisition: offensive melee spellcaster (can tank probably) that fights with staves and one-hand maces. A fanatic of the sacred with main CC named Crucifixion and a powerful spell named Stake that deal holy + fire damage (deal extra damage if target is stunned under Crucifixion). If you think that the inquisitor concept fits better with paladins, you are wrong, because paladins are into "political theme" while priests are into "religious theme".
Shadowstalker: a rogue focusing on shadow abilities and molesting girls.
Earthmend: In WoW already exist earthmenders among npcs. I don't know what they do in particular, but I guess they are those Shaman tankers that we all want to see in game.
Dark Arts: Shadow direct-damage dealer.
I don't see anything else for Warriors. Blademaster? Not sure it can be found another Warrior spec. Maybe one that improves three-handed melee weapons?