The updated "World of Warcraft" system requirements have been posted on the official forums in preparation for the upcoming Wrath of the Lich King expansion.
"We have updated computer system specifications required to run World of Warcraft in preparation for our next expansion, Wrath of the Lich King. Please also note the recommended specifications, which, while certainly not required, generally provide a more optimal gaming experience."
PC System Requirements
OS: Windows XP (Service Pack 3), Windows Vista (Service Pack 1)
Sound: DirectX-compatible sound card or motherboard sound capability
Mac System Requirements
OS: Mac OS X 10.4.11 or newer
Controls: A keyboard and mouse are required. Input devices other than a mouse and keyboard are not supported.
Connectivity: You must have an active broadband Internet connection to play.
Mouse: Multi-button mouse with scroll wheel recommended.
Hard Drive Space: 15 GB free hard drive space