Diablo 3

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User Interface (UI)

Here is description of Diablo 3 User Interface, the Diablo 3 UI.
Mana Bar

Let’s start with the mana and frenzy bars. In Diablo 3, instead of everyone having a mana bar, the fighter classes, or at least the barbarian will use a different bar than the mage classes. As you can see here, the mage classes, such as the Witch Doctor, use this mana bar.

Frenzy Bar
On the other hand, melee classes, will use this new bar, called a Frenzy Bar. I imagine that the Frenzy Bar probably regenerates faster than the Mana bar, and has much different mechanics. Such as the energy bars and mana bars in World of Warcraft.

Buffs
Buffs in Diablo 3 will appear on the bottom left side of the screen as you can see in this image (Barbarian’s Battle Cry Buff Can Be Seen):

Monster Targeting and Mini Combat Log
In Diablo 3, when you attack an enemy, the damage you do will appear above the enemies head. This is a great change from the past, where you could not see the damage you were doing to an enemy during the fight (only if you checked your character page. which was of course distracting while in a fight), or any other important information that helps you during a fight. Here are some examples:

Equipment Comparing

In Diablo 3, when selecting a weapon, to make it easier to choose a new weapon for yourself, you will be able to see the weapon you currently have equipped, next to the weapon you are looking at. Whether this is the same with all equipment, it is not confirmed, but I am sure that this is the logical case.

On Weapon Speed: In D3, weapon speed will be shown as “Attack per Second”. Also there will be a calculated result for “Damage per Second” based on the damage and speed. With lightning damage having it’s damage points ranging from 1 – x.
The Inventory
In the gameplay videos, and the inventory pictures, we can see room for 30 items. The new inventory system will be a bit similar to World of Warcraft where you will be able to carry variable sizes of bags. (There will be 4 grayed out slots for bags.)
Items will take one inventory slot regardless of their size, and some of the items will be stackable. This will allow you to carry a lot more of the same item. Adding bags also allows you to carry many more items than ever before.

Gear Slots:

- Head
- Shoulders
- Neck
- Hands
- Chest
- Leggings

- Waist
- Feet
- Finger R
- Finger L
- Weapon 1
- Weapon 2

Mini-Map
The mini-map which is of top right side of the screen, along with the name of the area that you are currently in right above it.

Legend:
The legends tells you what kind of NPC/Character you are targeting.

Yellow Dot – Hero
Purple Dot – Heros Mercenary, pet, and allies.
Orange Dot – NPCs (Like Deckard Cain, etc.)

NPC Portraits located top left of the UI: