From wow.incgamers.com

Statistics

Talent Improvements

Arcane Tree

Talent: Arcane Subtlety
Effect: Reduces your target's resistance to all your spells and reduces the threat caused by your Arcane spells by a %.
Statistics: Rank 1 = -5 target's resistance, -20% threat, Rank 2 = -10 target's resistance, -40% threat.

Talent: Arcane Focus
Effect: Reduces the chance that the opponent can resist your Arcane spells by a %.
Statistics: Rank 1 = 2%, Rank 2 = 4%, Rank 3 = 6%, Rank 4 = 8%, Rank 5 = 10%.

Threat Level

This skill causes no 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.