I think blizzard might actually not put bows/crossbows into game at all and surprise people. There might be some kind of alternative range weaponry in which new class might specialize. Example,
Soul Summoner (shooting souls at range, colecting weapons as souls) or..
Niggerian (obvious jk, but showing possiblities, using bumerangs of some sord)
And actually in D3 it seem that every class shall specialize in certain weaponry anyway. Not that much weapon trading inbetween classess ..
The 5th class should be a dunpeal, or half human/half vampire. Reasoning for fighting against hell would be that its corrupting all humans into demons, therefore eliminating their food (human blood). Not good nor evil, a mercenary type character that can use both ranged and close attacks with special abilities including those of a traditional vampire or super human senses.
considering there were vampires in d2....
and they were on the side of Diablo and Baal....
I don't think they are concerned with lack of food
and I thought vampires were 100% human, or humans were 100% vampire, idk how you can be both