• All accounts created on or after October 13, 2015 must use version 2.0.0 or greater of the CLI to facilitate Google account login.
• Added firebase data:* commands for accessing and modifying Firebase databases.
• Added firebase serve local development server for Firebase Hosting.
• Added ability to deploy Security Rules and Hosting assets separately.
• Added --token option for passing an access token in CI environments.
• Added --json option for machine-readable output.
• CLI login now takes place in the browser.
• The command firebase delete-site is now firebase disable:hosting.
• All command outputs have been re-worked and made more consistent.
• Improved the firebase init workflow.
• The firebase bootstrap command has been removed.
• The --email and --password flags have been removed.