There's a new update to the official Twitter app for iPhone. Twitter for iPhone 4.3 (free) arrived today with a number of new features and bug fixes that should make life with the app a lot easier.

According to the update notes, Twitter for iPhone 4.3 includes:

• Expanded Tweets -- when you view Tweet details containing links to partner websites, you can now see content previews, view images, play videos, and more (rolling out gradually)
• Enhanced experience around selected events with the bets Tweets and photos from those involved
• Push notifications for Tweets -- choose to receive notifications from people you follow any time they tweet or retweet
• Ambient notifications -- enables you to see brief non-interruptive notifications in the status bar while you're using the app
• Improvements to search autocomplete for users
• Discover -- now indicates when new stories are available for you to view
• Tappable avatars take you directly to user profiles
• Performance improvements
• Support for password entry in app when experiencing authentication issues
• Support for the Hungarian language
• Icon (image at right) features the new Twitter bird!

Of course, this is a universal app so if you're using the official Twitter app on your iPhone and iPad, both will be updated.