Now that Icecrown Citadel has been fully unlocked, allowing players the ability to progress in 10- and 25-player formats to defeat the Lich King, new raid weekly quests have been unlocked! These quests are specific to the Icecrown Citadel raid dungeon and do not correspond with the standard random raid weekly quest offered in Dalaran. Here’s an overview of what you need to know.

One of five quests will be randomly available each week in both 10- and 25-player versions of the dungeon. This means each player has the opportunity to complete two Icecrown Citadel raid weekly quests each week if the dungeon is run in both versions, however, these quests have to be completed within the raid version (10- or 25-player) in which they are offered.

If a player obtains one of these quests but does not complete it that week, the quest will automatically be removed from the player’s Quest Log the next time Lord Marrowgar is defeated under a new raid ID, or when zoning into an instance with a new raid ID where Lord Marrowgar has already been defeated. This only applies if the random raid weekly offered when the player enters a fresh Icecrown Citadel raid instance happens to be different from the one already in his or her Quest Log. Players can otherwise simultaneously have both the 10- and 25-player raid weekly quests in their Quest Logs and complete either of them at any time during the week in their respective raid versions. The quests given each week in 10- and 25-player versions of Icecrown Citadel will be randomly determined once Lord Morrowgar is killed, or once a player zones into an instance where Lord Morrowgar has already been killed.

The Quests:

• Deprogramming – Look for a rogue named Infiltrator Minchar outside of Lady Deathwhisper’s chamber. He’ll speak of a brainwashed operative who needs saving from the lady’s powerful means of influence. While engaging Deathwhisper, keep an eye out for a warrior named Darnavan among her minions. He must live if your raid group is to succeed in completing the quest.

• Securing the Ramparts – After taking the platform up to the ramparts from Lady Deathwhisper’s chamber, a lieutenant of your faction will seek your help in slaying the Rotting Frost Giant on the other end of the ramparts terrorizing his troops. Bring the monster down and return to the lieutenant for your reward.

• Residue Rendezvous - Should you succeed in killing Deathbringer Saurfang, you will soon meet Alchemist Adrianna upon lurking further into the citadel. She will task your group with the unfortunate job of being infected by both a Green Residue from Rotface and an Orange Residue from Festergut. While infected with both residues, at least one player from the raid must speak with Alchemist Adrianna in order for everyone in the group to receive credit.

• Blood Quickening – Outside the Crimson Hall awaits Alrin the Agile to inform your group that his friend, Infiltrator Minchar, has been captured by the San’layn for interrogation. Should you choose to help in rescuing Minchar, you will have 30 minutes from the moment you step foot in the Crimson Hall to kill Blood-Queen Lana’thel before she executes him. Fortunate enough for you, she will not kill Minchar if she is busy fighting your group.

• Respite for a Tormented Soul – If your group can successfully free Valithria, she will morph into her humanoid form to offer you a quest in a more approachable manner. Providing each player who accepts the quest with a Pulsating Life Crystal, a channeling device, Valithria will speak of a way to save Sindragosa’s spirit. Members of the raid who use these crystals on Sindragosa when she is below 20% health will slowly stack on her the Life Infusion debuff. Reaching 30 stacks (10-player) or 75 stacks (25-player) of Life Infusion before she dies will provide the frost wyrm with an aura of Soul Preservation. If your group manages to give Sindragosa this aura before killing her, a quest item can be obtained from her remains to complete Valithria’s task.

The Reward:
Completing any of these quests will reward each member of the group with a Sack of Frosty Treasures and a healthy chunk of gold. The sack will contain Emblems of Frost and other potentially valuable items!

(Source)