World of Warcraft Dual Spec Interview

Blizzard's official World of Warcraft website offers an interview interview with senior game designer Greg Street, detailing the game's upcoming Dual Spec talent system.
Nethaera: What is dual speccing?

Ghostcrawler: Dual speccing is the ability to save two separate talent specs, glyphs, and action bars.

Nethaera: Why are we allowing players to dual spec after all this time?

Ghostcrawler: We really felt like this was a great way to increase the flexibility available to players and encourage them to take part in more aspects of the game. To use just one example, some players like to participate in both raids and Arenas, which is awesome behavior that we want to promote. But, there are some talents which are more useful in one part of the game than another. Currently, players have to pay respec costs and go through the process of setting up the desired talent spec and action bars whenever they switch.

The new system makes this a much more logical process, saving on time and cost and allowing players to easily move from one aspect of the game to another.