RIM has finally released the beta version of Twitter for BlackBerry 2.1 in Beta Zone. We previously showed you an exclusive first look at what would be new in this build. Here’s the rundown of the new features:

Additional Profile Functions
You’ll notice that My Profile has two new icons: Edit Profile and Switch Accounts. While you could always edit your profile via the Menu, now you can use the Edit Profile icon right from the Profile screen to change your picture or update your personal information. And the Edit Profile screen has received a new facelift. Read on to learn more about the Switch Account icon in Multi-Account Support.

Multi-Account Support
The new Multiple Account Support feature lets you use up to five accounts on Twitter for BlackBerry smartphones. When logged into multiple accounts, the current user name will appear in the upper-left corner of the header bar and the user picture will appear in the My Profile icon. You can quickly switch between accounts by using the Switch Account function, accessible from My Profile or via the Menu. Have an interesting Tweet in one account that you’d like to share from another account? No problem, you can cross-post Tweets and Retweets from one account to another without switching the current account view. You can also stay notified of Mentions and Messages with real-time notifications for each of your Twitter accounts.

Download Twitter for BlackBerry v2.1 in BlackBerry Beta Zone here.