Here's a post I made over on the MoP beta boards and figured I'd bring the discussion here as well.
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I was talking to a warlock friend the other day about the minor glyph Death Knights get to change their ghoul into a geist (http://www.wowdb.com/items/43535-glyph-of-the-geist) and we got to thinking, "Why not add an Affliction only glyph to make the spec feel more like its Necromancer roots?"
I figure that there's two potential ways this can be done:
1. Simply swap the default warlock pet (Imp/Voidwalker/Succubus/Felhunter/Infernal/Doomguard) models with, say, a caster skeleton (Imp), armored skeleton (Voidwalker), the Rattlegore style skeleton (Succubus), Banshee (Felhunter), Abomination (Infernal), and a Nerubian caster (Doomguard) and changing nothing mechanically (they're still demons, they still do their respective damage types, etc).
or
2. Change the models along with some mechanic changes to better fit the appearance, such as:
* Rattlegore style pet casting Trance/Hypnotize instead of "Seduce"
* Banshee using "Shadow Touch" instead of "Shadow Bite"
* Abomination using "Plague Cloud" instead of "Demonic Immolation" (Doing nature or shadow instead of fire)
* Making these demon pets undead instead (shackle instead of banish) This is a case where this can become tricky.
I think this would be a neat way of making Affliction feel more like the Necromancer it was apparently suppose to be without actually making a new class and one of the best ways I could figure to not completely step on Death Knight's toes.