The most noticeable change is the new water engine and with the Cataclysm flooding a lot of zones of Azeroth, you will probably have a lot of occasions to experience it. Below are a few screenshots if you missed them. Each profession will have the possibility to modify your items to slightly modify their stats and replace them with new ones. Each profession get to reforge a type of items: cloth armor for tailors, leather for Leatherworkers, etc ... In my opinion, power leveling is more useful for the game players. It can help you save most of the time to work,play with your families. What do you think about power leveling service?

 

For example, a Blacksmith should be able to reforge your staff to reduce the Spirit bonus to add Intellect instead (= more spell power in Cataclysm, see the stats changes). World of Warcraft as a MMORPG (massively multiplayer online role-play game), it is lets player gather WoW experience to complete WoW power leveling. There are many ways to gain enough WoW experience (WoW power leveling), such as doing quests, PvP and combat. Something new for the beta is the Death Knight Skill: Runeforging. It enables Death Knights to imbue their Rune weapon with a special Rune that gives the Death Knight certain benefits, depending on the rune they chose to use.

 

Of course restrictions will apply and you can't create a +500 intellect breastplate just by removing all the other stats, the goal of this profession is to make items potentially interesting for more classes and reduce the amount of disenchanted items. Cataclysm will improve the graphic engine of wow power leveling once again and add a handful of new effects.