Twitter for Android had been updated to version 3.3, adding support for Twitter's new "expanded tweet" feature, as well as account-specific push notifications. You can now select any account you're following, and using the drop down menu, choose to receive push notifications whenever that account makes a new tweet. Pretty awesome stuff.
Auto-complete for user searches has become smarter as well, and you can now tap on the avatar of any account from a tweet to go directly to the user page. I've been waiting for that for a while. Oh, and the app now has Twitter's new sideways-Twitter-bird logo.