Warrior
Another one of Diablo 1's classes was the Warrior Diablo 4 Items, master of melee weapons but not particularly suited to the use of magic. Anyone looking for a hearty fighter that could additionally sustain himself by repairing equipment would be drawn by the Warrior. Unfortunately, the Warrior doesn't seem likely to return. First, it's a rather generic melee weapon class. Second, it would be hard to make the Warrior stand apart from classes like the Barbarian already confirmed for the game, and third, anyone interested in dominating the battlefield with durability and melee weapons shouldn't hold their breath for a Warrior -- the Barbarian will do.

Monk
Although in recent memory the Monk is probably best known for its appearance at launch in Diablo 3, it first appeared in Diablo: Hellfire, an expansion for the first Diablo game. Monks are melee fighters, but they rely on Dexterity and move through the battlefield with great speed. They're also known for flexibility in playstyle, offering healing and buffs on top of damage. Monks might have a shot at joining Diablo 4, since the game needs a Dexterity user. The problem is that Monks don't offer anything in the way of ranged weaponry, so they might be on hold.

Paladin and Crusader
Diablo 2's Paladin and Diablo 3's Crusader are similar enough that they're worth grouping together. They're both heavily armored melee fighters that supplement their fighting skills with divine might, smiting and impairing enemies. There's definitely a chance for a Paladin or a Crusader in Diablo 4, considering the game doesn't have any holy magic in its roster yet. That would seem essential in a game about warring with demonkind. There's a couple catches, though. Diablo 4 already has a tanky weaponmaster in the Barbarian, and there may be some lore hampering Paladins and Crusaders after Diablo 3. There seems to be a decent chance for one of these classes, but it's hard to say for sure.

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Amazon and Demon Hunter
Diablo 2's Amazon and Diablo 3's Demon Hunter might be some of the most likely additions to Diablo 4. Both classes offer weapon-focused and Dexterity-based gameplay, particularly featuring ranged weapons. That's what makes them good candidates cheap Diablo IV Items. There really isn't anyone that uses bows or crossbows in Diablo 4 yet, which seems like an odd niche to let go unfilled. Odds are good that there'll be room for one of the two in the game. It'll be up to Blizzard to decide whether the Amazon's melee capabilities or the Demon Hunter's dark skills are what Diablo 4 needs.