The Under Development page on the official website has been updated. We already heard about what's posted here and they're in the compilation below on the homepage, but I think that's the first time they talk about three new features (in bold)
[b] Sunwell Isle - A new area located north of Silvermoon City
- Sunwell Plateau - A high-level 25-player instance featuring six bosses
- Magister's Terrace - A high-level 5-player instance
- New Reputation - The Shattered Sun Offensive is Shattrath City's answer to Kael'thas's operations in the Sunwell; it is comprised of the combined forces of the Aldor and the Scryers, led by the naaru.
- New Daily Quests and Interactive Quest Hub
UI Improvements
- New combat log features and customization
Quest Improvements
- New daily fishing quest
- Maximum daily quests per day increased to 25
- New repeatable Battleground quests
Item Improvements
- New Heroic badge rewards
- Some PvP rewards now obtainable through PvE content
Caverns of Time
- New teleportation portal to the Caverns of Time accessible through reputation with Keepers of Time
Alterac Valley Improvements