Things to look forward to in the new interface:

  • An action bar that uses icons instead of text labels
  • A completely new interface for conversations
  • Profile pictures next to contacts
  • A flexible layout that adapts to any window size (will be useful when viewing on smartphones and tablets
  • Display density options like in Google Docs
  • Re-sizable chat/labels sections
  • New high-definition themes
  • An updated search box that includes advanced options.

The video was unintentionally made public and has now been taken down but a mirror copy exists (linked to above).  Screenshots can be seen at “Google Operating System- Unofficial News and Tips About Google”

More information about the new interface can be found on Google’s Official Gmail Blog