From wow.incgamers.com

Statistics

Talent Improvements

Discipline Tree

Talent: Inner Focus
Effect: When activated, reduces the Mana cost of your next spell by 100% and increases its critical effect chance by 25% if it is capable of a critical effect.
Statistics: N/A

Talent: Mental Agility
Effect: Reduces the mana cost of your instant cast spells by a %.
Statistics: Rank 1 = -2%, Rank 2 = -4%, Rank 3 = -6%, Rank 4 = -8%, Rank 5 = -10%.

Shadow Tree

Talent: Blackout
Effect: Gives your Shadow damage spells a % chance to stun the target for 3 sec.
Statistics: Rank 1 = +2%, Rank 2 = +4%, Rank 3 = +6%, Rank 4 = +8%, Rank 5 = +10%.

Talent: Shadow Focus
Effect: Reduces your target's chance to resist your Shadow spells by a %.
Statistics: Rank 1 = 2%, Rank 2 = 4%, Rank 3 = 6%, Rank 4 = 8%, Rank 5 = 10%.

Talent: Shadow Affinity
Effect: Reduces the Threat generated by your Shadow spells by a %.
Statistics: Rank 1 = -8% Threat, Rank 2 = -16% Threat, Rank 3 = -25% Threat.

Talent: Shadow Weaving
Effect: Your Shadow damage spells have a % chance to cause your target to be vulnerable to Shadow damage. This vulnerability increases the Shadow damage dealt to your target by 2% and lasts 15 sec. Stacks up to 5 times.
Statistics: Rank 1 = 20%, Rank 2 = 40%, Rank 3 = 60%, Rank 4 = 80%, Rank 5 = 100%.

Talent: Shadow Reach
Effect: Increases the range of your offensive Shadow spells by a %.
Statistics: Rank 1 = +10%, Rank 2 = +20%.

Talent: Vampiric Embrace Talent
Effect: Afflicts your target with Shadow energy that causes all party members to be healed for 15% of any Shadow spell damage you deal for 1 minute.
Statistics: N/A

Talent: Improved Vampiric Embrace
Effect: Increases the percentage healed by Vampiric Embrace by an additional %.
Statistics: Rank 1 = +5%, Rank 2 = +10%.

Talent: Darkness
Effect: Increases your Shadow spell damage by a %.
Statistics: Rank 1 = +2%, Rank 2 = +4%, Rank 3 = +6%, Rank 4 = +8%, Rank 5 = +10%.

Talent: Shadowform Talent
Effect: Assume a Shadowform, increasing your Shadow damage by 15% and reducing Physical damage done to you by 15%. However, you may not cast Holy spells while in this form.
Statistics: N/A

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.