The World of Warcraft Cataclysm game will work with Macs that meet the requirements: Mac OS X 10.5.8, 10.6.5, or newer: - Intel processor - 2 GB RAM or higher - 25.0 GB available HD space - 4X...
Which expansion is scheduled after Cataclysm is currently unknown, although unconfirmed rumors suggest it would be "Emerald Dream". This is based on very old leaked material though.