With the launch of the Cataclysm pre-expansion patch, some items and achievements will no longer be available or will be harder to obtain. It’s important to keep in mind that the game world is going through tremendous changes that will affect the availability of certain rare mounts and items.

•  Swift Zulian Tiger: Zul’Gurub is changing from a raid to a leveling zone and this mount will no longer be obtainable.
•  Swift Razzashi Raptor: This mount will also no longer be obtainable after the change to Zul’Gurub.
•  Razzashi Hatchling: With the change to Zul’Gurub, this non-combat pet will no longer be obtainable.
•  Tome of Polymorph: Turtle: This tome will continue to be available through other means.
•  Crusader’s Black Warhorse/ Crusader’s White Warhorse and  Swift Alliance Steed/ Swift Horde Wolf: As the attempt-based tribute system is being removed from Heroic Trial of the Crusader, the Argent Crusade Tribute Chest will no longer spawn, and these mounts will no longer be obtainable.
•  Reins of the Blue Drake: This mount will once again be available from defeating 10-player Malygos without needing to use the Dungeon Finder. The  Reins of the Azure Drake will only be available on 25-player Malygos.
•  Mimiron’s Head: This mount will change to be a very low drop chance when defeating 25-player Yogg’Saron with no Keepers assisting you.
•  Invincible’s Reins: This mount will change to be a very low drop chance when defeating Heroic 25-player Lich King.