[Cairenn]

New Content

• New Character Models: Blood Elf
• Twitter Integration
• New Heirloom Collections Tab
• Garrisons, Followers, and Outposts
• Cosmetic Transformations and Toy Effects

UI

• New Colorblind Options

• Players can now access a new suite of colorblind filter options under Accessibility settings in the Interface menu.

• New Death Recap Screen

• When a character is killed, a new screen now shows more information on what killed you.

• Premade Group leaders can now automatically accept applicants via a new "Auto Accept" checkbox after the group has been listed.
• Improved the ordering for categories in the currency tab.
• Players now receive a banner notification after defeating a dungeon, raid, or world boss in Warlords of Draenor or Mists of Pandria.
• Loot eligibility lockouts for Draenor world bosses (Drov the Ruiner, Tarlna the Ageless, and Rukhmar) are now tracked in Raid Info under the Raid tab.
• Popup notifications such as those for completing an achievement or receiving a reward after a Battleground match can now be dismissed by right-clicking on it.
• Added an "Ignore this bag" option to Profession bags for bag clean up.
• All multi-page windows now support mousewheel scrolling.

Source and full patch notes