From Bornakk today:
As we mentioned in the recent post explaining the new Dungeon System, disenchanting will work a little differently in all 5 player and raid dungeons when patch 3.3 is released. We have seen a consistent pattern where players eventually need very few items from dungeons and they result to disenchanting as much of the loot as possible since those materials that can be obtained continue to have a lot of worth.
When the new Dungeon System is launched, the default user interface will give players the option to automatically disenchant items that they obtain in 5 player and raid dungeons. This option will avoid the hassle of having items picked up by an enchanter first to redistributed later and overall will make the process much smoother.
Also, with the inclusion of cross-realm-instancing in the dungeon system, there will be restrictions on trading items similar to the restrictions that are currently active in Battlegrounds. If the Dungeon System is used to complete a group for a dungeon then non-temporary items will not be able to be traded in the instance. This makes it so items like enchanting materials will not be able to be traded in the dungeon and using the new user interface option will be the only way to distribute disenchants. There will be some exceptions to this restriction though as Bind-on-Pickup items will continue to be trade-able to those present for the kill for a short duration and completely pre-formed groups that don't use the Dungeon System to form the group will still allow trades.
To maintain the importance of the profession itself, the disenchanting UI option will only be available for groups that have a character with the necessary level of Enchanting to disenchant the items that are obtained.
is the last major patch of Wrath of the Lich King
. With the new Icecrown Citadel 5-man dungeons and 10/25-man raid arriving soon, patch 3.3 will deal the final blow to the Arthas. WoW.com's Guide to Patch 3.3
will keep you updated with all the latest patch news.