Best in slot for all three specs in 4.3

This is the best in slot for a destruction warlock as of 4.3 for normal mode raids. The BIS for a demonology warlock and affliction warlock are very similar. For both demo and aff the trinkets are Cunning of the Cruel(shared boss loot) and Will of Unbinding, and for demo ring 2 should be Infinite Loop(shared boss loot). The rest of the list is true for all specs. Now for the destruction spec picking Insignia of the Corrupted Mind as a BIS item may not be true always. Once you get your haste to about 2500 and higher this item may be a dps loss due to it "bottlenecking" you and Cunning of the Cruel will be a better choice. I will discuss this later.

Head-Hood of the Faceless Shroud (Warmaster Blackhorn head token drop)

Neck-Flowform Choker (Herioc Majordomo Staghelm) (Opal of the Secret Order from the VP vendor would be a good alternative)

Shoulders-Mantle of the Faceless Shroud (Hagara the Stormbinder shoulder token drop)

Back-Nanoprecise Cape (VP vendor)

Chest-Robes of the Faceless Shroud (Ultraxion chest token drop)

Wrists-Bracers of Unconquered Power (Tailoring crafted item) (Bracers of the Banished from Hagara the Stormbinder would be a good alternative)

Hands-Gloves of Liquid Smoke (Spine of Deathwing)

Waist-Cord of the Slain Champion (Warlod Zon'ozz)

Legs-Leggings of the Faceless Shroud (Yor'shaj the Unsleeping leg token drop)

Feets-Janglespur Jackboots (Warmaster Blackhorn)

Ring 1-Ring of the Riven (Hagara the Stormbinder)

Ring 2-Seal of the Grand Architect (VP vendor)

Trinket 1-Will of Unbinding (Spine of Deathwing)

Trinket 2-Insignia of the Corrupted Mind (Yor'shaj the Unsleeping)

Wand-Hungermouth Wand (VP vendor)

Weapon-Lightning Rod (Hagara the Stormbinder) ( If by chance you have Dragonswrath, Tarecgosa's Rest it is BIS)
P.S. Changing any item in this list will most likely change the "BISness" of the rest of the list. Based on gemming and reforging issues there may be a better combination if you change one item on this list other than the trinkets and the two choices in weapons mentioned above.