Weapons have a Slow, Fast, or Very Fast Attack Speed. Daggers, Focuses, and Wands are the fastest.
The Inventory and Stash screens have multiple quality-of-life features, like item type tabs and smart sorting.
Diablo 4 has hundreds of Regular, Legendary, and Unique affixes that can roll on items of all slots.
Item durability returns for Diablo 4, forcing players to periodically return to town and pay gold to repair items.
The Item Power value appears on Armor, Jewelry, and Weapons. It summarizes how good an item is.
Diablo 4 has six item rarities: Normal, Magic, Rare, Set, Legendary, and Unique. Set items won't return.
Magic Find will return in Diablo 4, possibly as a gem bonus and also on some slot items, like Rings.
Mythic items, the formerly highest tier of Diablo 4 items, were removed by Blizzard and replaced with Uniques.
Diablo 4 won't include a real money or in-game money auction house. The feature was unsuccessful in Diablo 3.
Most items can be traded, with the exception of Legendary and Unique items, and Legendary Aspects.
Gold will have many uses, including buying items, gambling, repairing items, and trading with other players.
Obols are used for gambling for rare items at the Purveyor of Curiosities. They're rewards for finishing events.
The game's fun depends on itemization
Many players say that itemization is the "special sauce" that makes Diablo games fun, and that Diablo 2 scored the highest marks on this. Diablo 4 brings back many of the same item qualities (e.g., Normal, Magic, Rare, Set Legendary, and Unique), but tweaks their mechanics to make all of them potentially useful. Systems like Magic Find, item durability, and class specific items also return.