As leaked earlier this week, Twitter has released a major update to its iPhone application with improved notifications, interactive tweets and more. Here are all of the new features:

- Expanded Tweets: when you view Tweet details containing links to partner websites, you can now see content previews, view images, play videos and more [please note: this feature is rolling out gradually]
- Enhanced experience around selected events with the best Tweets and photos from those involved
- Push notifications for Tweets: choose to receive notifications from people you follow anytime they tweet or retweet
- Ambient notifications: enables you to see brief non-interruptive notifications in the status bar while you are using the app
- Improvements to search autocomplete for users
- Discover: now indicates when new stories are available for you to view
- Tappable avatars that take you directly to user profiles
- Performance improvements
- Support for password entry in app when experiencing authentication issues
- Hungarian language support
- Updated with new Twitter bird
- Many other tweaks, polish, and bug and crasher fixes

You can grab the free update from the App Store here.