TIER 4 TOKENS DROP IN:

Karazhan--
Gloves:  Curator
Helm:    Prince Malchezaar

Gruul's Lair--
Shoulders:High King Maulgar
Legs:    Gruul

Magtheridion Lair--
Chest:    Magtheridion

TIER 5 TOKENS DROP IN:

Serpentshrine Cavern (SSC--

Gloves:  Leotheras the Blind
Shoulders:Void Reaver
Legs:    Fathom-Lord Karathress
Helm:    Lady Vashj

Tempest Keep--
Chest:    Kael'thas Sunstrider

TIER 6 TOKENS DROP IN:

Hyjal Summit--
Gloves:  Azgalor
Helm:    Archimonde

Black Temple--
Shoulders:Mother Shahraz
Legs:    Gathios the Shatterer
Chest:    Illidan Stormrage


Once/if you get the token to drop and actually win them, you then take them to the vendor in Shattrath City depending on whether your Aldor or Scryers and they will grant you a corresponding item of your choice.

Good Luck-
IMHINA
Burning Legion