In a separate post, Blizzard has released a thread containing links to the many changes in Cataclysm reflected in Patch 4.0.1.  If you are having trouble viewing it at work, I am posting the thread here: [Source]

The first major patch for World of Warcraft: Cataclysm is upon us. In this patch players will experience major class and talent changes, all-new user interface options, and other systems improvements setting the framework for World of Warcraft’s third expansion.

Here you’ll find a host of resources, including the patch 4.0.1 notes and known issues, as well as what’s changed, what’s new, and everything else you need to know about patch 4.0.1.

General Information

• Patch Notes: http://forums.worldofwarcraft.com/thread.html?topicId=27189089672
• Known Issues: [Coming Soon]
• Cataclysm Streaming Launcher: http://forums.worldofwarcraft.com/thread.html?topicId=27188059042&sid=1

Gameplay Information

• Class Mechanics Changes: http://forums.worldofwarcraft.com/thread.html?topicId=27189089049&sid=1
• Changes to Glyphs: http://forums.worldofwarcraft.com/thread.html?topicId=27188059040&sid=1
• Currency Changes: http://forums.worldofwarcraft.com/thread.html?topicId=26850245012&sid=1
• Currency Conversion: http://forums.worldofwarcraft.com/thread.html?topicId=27026323214&sid=1
• Currency – Justice Point Drop Quantities: http://forums.worldofwarcraft.com/thread.html?topicId=27026399005&sid=1
• Flexible Raid Lock System: http://forums.worldofwarcraft.com/thread.html?topicId=27026324753&sid=1
• Gem Changes: [Coming Soon]
• Guild Member Cap: http://forums.worldofwarcraft.com/thread.html?topicId=27026480920&sid=1
• Guild UI Changes: [Coming Soon]
• Item Reforging: [Coming Soon]
• Stat Changes: [Coming Soon]

Patch 4.0.3 and Cataclysm

• Under Development: http://www.worldofwarcraft.com/info/underdev/