Class mounts and abilities will remain available via trainers.
As we all know, Cataclysm will completely change the face of Azeroth. Many old quests are going to disappear, which means that players will no longer be able to complete some class specific quests. Nethaera has confirmed on the official forums that class mounts and abilities will remain available via class trainers even if the associated quests are removed from the game.
Nethaera also mentions that Blizzard plans to implement a level 20 dungeon-based quest in the expansion that will offer a weapon reward for all classes. A similar level 50 dungeon quest will give players a headpiece reward. You can read all the details after the jump.
Azeroth is on the eve of a dramatic transformation, and as World of Warcraft changes, sometimes the old must go to make way for the new. Since the world elements that support them will be gone, many aging quests will exist only in the mists of the past.
In particular, there's been some confusion regarding lower-level class specific quests that can no longer be completed. Never fear: class mounts and abilities remain available via class trainers, even though the quests associated with them are no longer available. Also, there are several low and mid-level weapons, trinkets and robes that were once awarded via class specific quests which are no longer available and their associated quests have been removed.
We are looking forward to offering new quests, quest lines and rewards as players level through World of Warcraft: Cataclysm instead. For example, we plan a level 20 dungeon based quest which will offer weapon rewards appropriate to all classes. There will also be a similar level 50 dungeon quest which has a headpiece reward.
Finally, if your Blood Elf paladin missed out on the Blood Knight Tabard, then you should still be able to acquire one via a race specific version of the level 50 dungeon quest. Those of you hoping to pick up a Rhok’delar, Longbow of the Ancient Keepers might be happy to know that the issues which were preventing the completion of this quest should now be resolved. It’s a good idea to keep in mind that even though this item is related to a level 60 quest line, that only level 80 characters will be eligible to acquire the necessary materials from the Onyxia’s Lair encounter. The good news for level 60 characters is that Nefarian has finally decided to grow some Mature Black Dragon Sinew, so interested players can complete the quest by picking that item up from him in Blackwing Lair.