Some of us might think Diablo III is good the way it is and it should already be realesed but Jay Wilson, the game director for Diablo III definitely thinks different. He wants to make sure the game will be perfect before it's released which of course leads to major changes in game system.
Originally Posted by Jay Wilson
Some of major changes are:
Town Portal back in Diablo III
we've decided to just call it what it is and the Stone of Recall is now Town Portal, and is integrated directly onto the skill bar UI.

Scrolls of identification were removed from the game
Unidentified items and the act of identifying them is still very much part of the game, but now when obtaining an unidentified item you'll simply right click it, a short cast timer will occur as your character examines the item, and it will become identified. We love the double-discovery of finding a present and then unwrapping it, but we don't think it requires a physical item you have to find and keep in your bags to get the same effect.
They were implemented to allow for salvaging and selling items when there was no quick and easy way to return to town. Now that the Stone of Recall exists, we found that keeping the Cauldron and Cube in the game detracted from the benefits of returning to town to sell items, salvage, craft, and interact with the townsfolk
White items are no longer salvageable
We found that it caused a few itemization issues, but mostly this is due to a general philosophy shift on the importance of items. Previously, our thinking was that when an item dropped it should always be useful to you in some way, either the stats could be an improvement for you, or in the case of white items you could break it down and craft something better. Through a lot of play testing we have come full circle to the Diablo II methodology -- a lot of stuff that drops just isn’t worth picking up. Diablo II captured the loot piñata feel by dropping a lot of crap, mostly arrows and bolts, and we of course still very much want that feeling of item-explosions. To do that we need to be able to balance the value of items to how many we’re throwing at you.
benefits each stat provides is being broken down as:
Strength
+Barbarian damage
+Armor
Dexterity
+Demon Hunter damage
+Monk damage
+Dodge
Intellect
+Wizard damage
+Witch Doctor damage
+Health from globes
Vitality
+Health
Strength
+Barbarian damage
+Armor
Dexterity
+Demon Hunter damage
+Monk damage
+Dodge
Intellect
+Wizard damage
+Witch Doctor damage
+Health from globes
Vitality
+Health
For more info visit Diablo III site
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