Here's the quoted changelog from v2.0:
- Added Nearby Tweets as a pinnable section and to the discover page. Now easily see the tweets around your current location!
- Added the ability to find new people in the Discover page, now browse categories of recommended people to beef up you Twitter feed.
- Added quick picker to compose for images, now quickly pick from the last images in your camera roll, or take a new image.
- All new autosuggest experience for users and hashtags.
- View Gifs in the app image viewer.
- Easily select gifs to post in the Compose page
- Upload videos to Twitter!
- Now see attached media inline with quoted tweets.
- Lots of large performance improvements.
- Fixed a few memory leaks which would degrade responsiveness after running for a long period of time.
- Vastly improved memory management when switching between multiple accounts, should make the switch much more seamless.
- Improved smoothness of scrolling under various conditions.
- Improved back and memory usage related to streaming.
- Fixed issues where column navigation would not adapt to changing window size.
- Fixed an issue where resized images could be unrecognisable.
- Further improvements for read position restoration after some experimentation.
- Stability and sync improvements for reading/firing notifications.
- Fixed app version in about page.
- Addressed two edge cases which could cause read position to restore at the same position.
- Sync between device greatly sped up & will restore to positions that haven’t been cached on the client yet.
- Fixed an issue where deleting a tweet from Retweets could replace your home timeline with retweets.
- Fixed a bug which could cause you press back twice to navigate backwards within the app.
- Fixed some layout issues with discover page in mobile.
- Fixed a crash when editing profile.
- Retweet options now show up correctly next to retweet button.
- Fixed an issue with the remove dialog for attached images to tweets would not display properly.
You can grab this in the Store here - it's a commercial app, like Tweetium, but you do get a lot of code/effort/value for money. And £2.29 (in the UK) doesn't exactly break the bank.