This month's (October) Computer Gaming World features a huge article on World of Warcraft, revealing more exclusive information than ever before. There are 3 new races announced: Trolls, Gnomes, and Undead. They also reveal 3 classes: Priest, Rogue and paladin, as well as one high-level specialization class, the hero.
WarcraftCentral featured this on their news today, and included 4 article scans from CGW. One of them is the magazine cover, featuring a huge undead character (see below). Check out their site for the other scans and coverage. Battle.Net forums also have an ongoing coverage, with members posting their comments and some information.
