From wow.incgamers.com

Statistics

Talent Improvements

Restoration Tree

Talent: Subtlety
Effect: Reduces the threat generated by your spells by a % and reduces the chance your spells will be dispelled by a %.
Statistics: Rank 1 = -4% threat and -6% dispel chance, Rank 2 = -8% threat and -12% dispel chance, Rank 3 = -12% threat and -18% dispel chance, Rank 4 = -16% threat and -24% dispel chance, Rank 5 = -20% threat and -30% dispel chance.

Threat Level

This skill causes a moderate amount of Threat.

Uses in PvP

Please feel free to add a bullet list of uses within PvP or editorial if you have more to say. What use is it against other builds, what skills can it be used to counteract or prevent. What skills does it work well in combination with.

Uses in PvE

Please feel free to add a bullet list of uses within PvE or editorial if you have more to say. Which creatures/bosses in particular is it useful against. What skills does it work well in combination with.