Diablo store

Diablo III is similar in style to its predecessor, Diablo II. The proprietary engine will incorporate Blizzard's custom in-house physics, a change from the original usage of Havok's physics engine, and feature destructible environments with an in-game damage effect. The developers are aiming to make the game run on a wide range of systems, and have stated that DirectX 10 will not be required. Enemies will utilize the 3D environment as well, in ways such as crawling up the side of a wall from the depths into the combat area.
Jeweler Recipes Diablo III will use a custom 3D game engine in order to present an overhead view to the player, in a somewhat similar way to the isometric view used in previous games in the series.

9/22 Update: Datamined info confirmed on official Diablo 3 site. Here are the list of gem recipes.
From datamined info, there seems to be recipes for gem tiers 11 through 14. Meaning that for the highest level gems, you will need to find a recipe before your artisan has the ability to combine gems of the highest tiers.
Jeweler Gem Designs Spreadsheet
Benefits Summary
Craft Amulets and Rings
Can craft gems
Remove gems from socketed items (without destroying either item)
Combine gems to improve their quality
As you level up the artisans, their cart will visually improve.
Diablo III will give players the choice to make hardcore characters, similar to Diablo II.

Hardcore characters cannot be resurrected and become permanently unplayable if they are killed, and they do not have access to the real-world money auction house. Hardcore mode is only available after a completion of the game.