1. Massive Cloud Services Integration
Cloud based services like Google Drive, Facebook, etc. now integrate directly into the Dash command centre. Now you can search for not just local files, but also dig through your data in the cloud with a single click of the Dash command centre.
Further, Ubuntu 12.10 includes native support for many web apps, including Facebook, Twitter, Gmail, etc. After authenticating your accounts (on Gmail, Facebook, etc.), you can display alerts for new mail and messages in the consolidated notification area, turning the desktop into a full-fledged web portal.
Additionally, the Dash looks better with a new skin and improved functionality, such as the ability to run files in the preview screen itself.