Base Game Patch Features & Content
A 64-bit client for PC and Mac
Improvements to grouping including incentives and cross-alliance grouping outside of the Grouping Tool
Tons of combat and gameplay balance changes
Scrolling combat text (SCT)
Improvements and updates to Cyrodiil and its campaigns
Access to content from other alliances in any order you choose upon reaching Veteran Rank 1
Prioritization of animations during combat
Improved facial animations for Mac
…and more!
Ah, Gina answered this over here:
http://forums.elderscrollsonline.com/en/discussion/comment/2614989#Comment_2614989