WoW Forever Talent Reset and Dual Spec

Short answer: go to your class trainer in a major city to reset talents. Legacy talents reset along with the rest. Dual Specialization unlocks at level 40, so you can keep two builds and switch between them.
How talent points work
Your first talent point arrives at level 10. Each tree has one-point milestone talents at 11, 16, 21 and 31 points spent, so plan routes that reach those thresholds (Blizzard Class Deep Dive). Test a build first in the WoW Forever talent calculator.
How to reset talents
- Travel to a major city and find your class trainer.
- Choose the talent reset option.
- Every point comes back, including Legacy talents, and you can rebuild straight away.
What a respec costs
During the beta, Blizzard set the cost at 1 silver if you had not reset recently. Resetting again soon after cost much more, falling back to 1 silver once an hour had passed. Blizzard labelled this as temporary for the beta (beta development notes). The launch price is [Unconfirmed], and we will update this page once it is live.

Dual Specialization at level 40
From level 40 you can hold two talent setups, for example a levelling build and a dungeon build, or a tank spec and a damage spec (Blizzard Class Deep Dive). A third spec has not been announced.
When a reset is worth it
- You reach 40 and want a group-role spec next to your levelling one.
- A patch reworks your tree, as with the datamined Paladin and Druid changes in build 70707 [Unconfirmed], see patch notes.
- You change from solo questing to dungeons. Check tier lists and your class hub on the classes page.
FAQ
How do I reset talents in WoW Forever?
Visit your class trainer in a major city. The reset clears all talents, Legacy talents included.
When do you get dual spec in WoW Forever?
Dual Specialization opens at level 40, according to Blizzard's Class Deep Dive.
How much does a respec cost?
In the beta it was 1 silver if you had not reset recently, with a higher cost for repeat resets that fell back to 1 silver after an hour. Blizzard said this was beta-only, so the launch cost is unconfirmed.

Is there triple spec in WoW Forever?
Blizzard has only announced Dual Specialization at level 40. We have no source for a third spec.
Sources
- Blizzard — WoW: Forever Class Deep Dives: Priest and Warrior
- Blizzard — WoW Forever Beta Development Notes (Updated October 26)
- Wowhead — WoW Forever news (respec and dual spec)