Dual spec is one of patch 3.1's headline features: for the price of 1,000 gold, you can unlock the ability to keep a second spec for your character, which you can switch to for free. It was stated a while back by Ghostcrawler that dual spec would only be available to level 80 characters, which was upsetting to many (including myself). It's a feature that has the potential to be amazingly useful for those who like to do dungeons while leveling - why remove that possibility?
I am happy to report, therefore, that Zarhym has just reported that dual spec will be available to characters of level 40 or higher. This is an excellent compromise between not wanting to confuse newbies, and giving players the flexibility to heal dungeons (for instance) as they level while not being gimped in solo play. The real game might begin at 80, but it's important not to neglect 1 through 79.
Furthermore, the announced reagent requirement has been removed - no longer will players need to be in a city or find an inscriber to create a portable lexicon of power for them. Now that's a dual spec feature I can love, even at a 1,000 g cost. Update: Zarhym has clarified the processs a little bit. "You literally just click a button," it's a five-second cast, it swaps your glyphs and action bar along with your spec, and there's no cooldown. You can't use it in combat or in BGs/arenas.
Patch 3.1 brings us Ulduar, dual specs, significant changes to all the classes, and more! We've got you covered from top to bottom with our Guide to Patch 3.1.