RIM just officially released Twitter with version 1.0.1.12. There is no official change log.

Download OTA :

blackberry.com/twitter

For OS 5 : http://bit.ly/fz5p2m (local link)

For OS 6 : http://bit.ly/f4KdNt (local link)

Desktop Installer :

For OS 5 : http://bit.ly/eGnqkT

For OS 6 : http://bit.ly/dRCNr7