Originally Posted by
XorMalice
Immolation gestated as Flame Shield in Warcraft II. This silly mage move let you cast five silly rotating cloud-things that were little fireballs. They damaged anything, friend or foe, around the unit you cast it on (also friend or foe).
By Warcraft III, Demon Hunters had a spell called Immolation. This spell introduced the modern name, icon, and graphical effect. When a Demon Hunter casts Immolation, he burns with an actual fire. Those around him take damage. In Warcraft III, this spell uses up mana at a moderate rate, and damages enemies at a pretty decent clip.
When Warlocks came along, they got a spell with the same spell name and icon as the Demon Hunter immolation. But it was the opposite in all ways- instead of being a self cast, it was a ranged cast. Instead of being on YOU, it was on an enemy. Instead of damaging multiple enemies, it only damaged the target.
At some point, a different version of this was available to meta-form locks as well, I think with a different name (like "self immolation", I don't recall).
Personally, I very much hope they rename the warlock one to something else, and give Demon Hunters the immolation that they had in Warcraft III. This would be a perfectly interesting move for aoe damage over time.
Mana burn was a priest spell for years before being removed. It seems likely it will stay removed- as cool as it was, it was a rough sell in WoW. If mana burn was added to Demon Hunters, it would be rather odd which enemies they would suddenly be more effective against, and healers would have to watch out for the stun or snare into mana drain (depending on implementation). If they wanted to use it, it could be a cooldown move- an instant move that dealt damage and destroyed mana, but with a long enough cooldown that it wouldn't be able to be used in an attrition war. I still think it unlikely.
"Evasion" was a passive. It was given to rogues entirely, at which point it became an active. It's very likely that Demon Hunters, especially the tank ones, will enjoy a bonus to dodge, but it seems unlikely to be a flat 30% boost or something. We shall see.
If you check the thread about what we know about Demon Hunters, you'll see they wear leather. This is confirmed by Blizzard.