This blog is a part of the following video: http://www.youtube.com/watch?v=ZvNoKXCNh-8&feature=youtu.be

Destruction Warlocks in 5.0.4:
With patch 5.0.4, destruction warlocks received many changes and with it came new abilities and old abilities revamped or removed. For example, Destruction loses its Soul fire and corruption, while it focuses on immolate, conflagrate, incinerate and chaos bolts. It's really all about building up Burning Embers and spending them on Chaos

Stat Priority in 5.0.4:

Intellect >  15% Spell Hit > Haste > Crit => Mastery

- The most important stat is still Intellect, although everyone's mana has been downgraded (or upgrade) to 100.000k at level 85. However, intellect still improves your spell power which improves the power.. of your spells. That's why intellect is still the number 1 stat.
- 15% Spell Hit is really important, else you'll keep missing your targets and that's really bad for your chaos bolts since they hit very hard.
- Haste improves the DoT time of immolate and increases your cast time. Really important stat!
- Crit rating gives a better chance of hitting your enemy.. criticaly.
- Mastery improves the power of Burning Embers, as well as your core abilities. Mastery and Crit have the same value, though Crit is favored by most.

Don't use these stats:
 - Spirit is still useless for destruction warlocks, because you'll get 624% increased mana regen from the Destruction tree. No worries there, so don't steal the loot from priests.
- Strength and Agility don't add anything for warlocks.
- Expertise and more than 15% SPELL hit shouldn't be on your gear. You're not a hunter after all.
- PvP Resillience and PvP Power, unless you're PvP'ing. This is a PvE guide.

Reforging stuff:
- If you don't have 15% SPELL hit yet, reforge either mastery or crit from your items to hit.
- If you're above 15% SPELL hit, reforge HIT > Haste or Crit.
- If your hit is fine, reforge your crit/mastery > Haste.

Rotation:

Check out this video for the full rotation.