There are some undocumented changes in the 2.3 patch, here's some of what WoW Insider found with more after the jump...

• Boats and zeppelins which carry players now have NPC crews, including vendors.
• There is a new neutral flight path outside of Zul'Aman, which means you can now fly out from Silvermoon City.
• Whoever in a group has loot rights to a corpse will appear on the minimap (LOOT THE DOG!)
• There is now a log in the guild information tab that allows you to see promotions, kicks, joins and leaves.
• Mousing over the mail icon will show you the name of the mail sender.
• Track Humanoids distinguishes between friendly and hostile targets.