The number of fragments dropped from Archaeology artifacts has been increased, you can now get 5-9 fragments instead of the 3-6 you've gotten in the past.
Seeing dig sites on the mini-map is very helpful for navigating around the borders of a dig area.
Profession quests at the Darkmoon Faire appear to require a skill level of 75 according to posters on Wowhead.
Those who fish can find a new (and awesome!) Sea Pony from the waters at the new Darkmoon Faire! Visit El's Anglin to learn more about it.
The rare Burning Crusade enchant Executioner is now available in unlimited quantities from Dealer Jadyan at the Stormspire (Netherstorm). Previously this recipe dropped in the now defunct Zul'Aman raid.
Some classic vanilla recipes that required unusual ingredients (such as silithid chitins and copper modulators) were changed to use more common items. Make sure you double check older recipes before purchasing materials.
Dungeon quests in Outland have been reset. If you need a transmog item from one of those quests, you can repeat them to get it. A good example is the quest War on the Ramparts, which rewards a plate shoulder item that matches very nicely with the Fel Iron Plate set.
Feel free to share anything new you've found this week in the Comments!