The update that Twitter has released is more of meeting the needs of its users who have requested phone friendly features for all who love twittering on the streets, or practically anywhere. First of all, you can now receive updates on push notifications, without the need of being interrupted in doing other things on the phone. You will see your friend tweets anytime without disturbance. This can be done by touching the settings and tweaking some of it for additional preference.
People who have multiple Twitter accounts will enjoy the ease of changing the account with no worries. It is now simple to switch from person A, to person B, and C, just to update some tweets and getting back again. Version 2.1.0 is already available for download on the Android market once you access your apps for getting the upgrade to the system, which works well on Android 2.1 and above.
Source: Twitter Blog