One of the biggest new features in today's patch 3.1 is dual spec capabilities. It's been through many iterations on the PTR, and there's a lot of information floating around (check out our full guide to dual specs), but here's the abbreviated version.
- Go see your class trainer. Bring 1,000g and be at least level 40. Make sure the glyphs you have on right now are the ones you want to be associated with your primary talent spec.
- Ask your trainer nicely for dual-spec capabilities, and pay that 1,000g.
- All your talents are now reset, and you now have access to a second set of them. Set up your talents as you wish, buy new skills as required, and add glyphs to your second spec.
Congratulations! You may now switch specs any time you're out of combat (except in arenas). The video above shows the process of switching specs; doing so also switches your action bars and your glyphs (you store a separate set of glyphs for each spec). Switching specs does not require a Lexicon of Power. In fact, Lexicons of Power are not required for anything any more, not even glyphing. Each of your two sets of talents can be reset just like you're used to resetting talents; resetting one does not disturb the other. Happy talenting!