The forthcoming Mists of Pandaria expansion for World of Warcraft will be bringing along a revamped talent tree as well as fluffykins up there. Not happy with how players built identically specced characters at their most statistically efficient, Blizzard are hoping their new system will make it more tempting for players to forge their own path through the levels.
Three specilisations will be available for every class with specific spells assigned to each one. Meanwhile, talents are available for every spec in that class, and will be awarded every 15 levels. These talents will be interchangeable as you play, further tempting players to rebuild and experiment with the numbers. Sounds a lot like Diablo 3, come to think of it.