The latest build introduced a VERY interesting feature to the game: a built-in PowerAuras. If you are unfamiliar with the mod, it is mostly used to watch and warn players when a spell proc is available and the game clearly reached the point where it's fairly hard (or just annoying) to play at high level without a mod like this.
Blizzard eventually agreed that watching your buff bar isn't really fun and a new icone appears on your character when situational spells such as Art of War are available, see the screenshot below.
Mages - Teleport/Portal Interface
Mages are getting an interface upgrade similar to Shaman's totems for their portals, you can now add a generic "Portal" and "Teleport" spell to your bar and pick a portal after clicking it.
Darnassus - The Howling Oak
A new sub-zone was added to Darnassus in the latest beta build - The Howling Oak, the area isn't populated yet but it looks like it will be the home of the worgens in Darnassus.
Reforging - Video and Screenshots
For some reasons I still get a lot of questions about reforging, this new feature is fairly simple: You talk to a NPC in capital cities to swap 40% of any of the secondary stats of an item (ratings / Spirit) for another secondary stat. TotalBiscuit released a video of Reforging in the current beta build, if you want to take a look at it.
Originally Posted by Blizzard Entertainment