Quote from Airandius
...all arch types will be covered if you look at it from a marketing perspective.
Their are multiple segments in the RPG market, people that like melee combat, people that like ranged combat and people that like magical combat. (To keep it simple.)
When there is a game where you can choose a class, these three arch types will be covered.
Why? Because it would be a slap in the face for any company to ignore a segment they try to target. Blizzards target for D3 are people that play RPG style games (mainly) but also older players that know D2 and D1 or other franchises.
It comes down to this: if they do not include the ranged combat arch type they will have a segment that would not buy their game (a good part of the segment might still buy it, but sales are reduced no doubt).
This is basic management and economy.
Biggest reason that the 5th class will be a ranged character. (The base product will want to get most segments. The strategy to put it in an expansion is possible but the sales will not be as high as if it was in the base product.)
Also my poor English might have screwed with the sentences.
How can you say that all of the archetypes will be covered when there is no quintessential sword and shield using character? This is the oldest and most prominent RPG archetype that exists. If any character omission is going to keep away potential customers, this is it. Certainly, Blizzard is aware of this. With Diablo 1 we had the warrior, and with Diablo 2 we had the paladin. Along with a wizard of some sort, this type of character is the most essential character in any RPG. I agree that a ranged character is extremely important, I just don't think it is as important as a warrior. Therefore, I disagree with the masses who believe the final class will be a rogue or ranger. I think it is much more likely that the fifth class will be primarily a melee character, and probably secondarily a ranged character.