Patch 4.3 - Deathwing, Transmogrifier, Void Storage

From MMOChampion.com, Patch 4.3 (most likely the final patch of Cataclysm) will feature...

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  New Raid - The Deathwing raid, making it very likely to be the last patch before the next expansion.
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  3 new 5-man instances - Including one in the Caverns of Time. (War of the Ancients was mentioned as a cataclysm instance a few years ago, but a lot of things have changed since then, who knows!)
• 
  The Transmogrifier NPC, which will let you change the appearance of any armor piece on you, while retaining the stats of your current gear. (= T12 stats, but with the Tier 2 look!)
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  Players won't be able to change the appearance of their armor into another armor type or class armor set, and you might have to own the armor before you can use it to swap the appearance of your existing armor.
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  The Void Storage is a new type of bank where players will be able to store their old armors in order to free up space in their regular bank.
• 
  The Abyssal Maw dungeon is gone for the moment, the storyline wasn't convincing enough/fitting.

This is from Tom Chilton's interview at GamesCon in Cologne, Germany.