"Some users are reporting that App World has pushed BlackBerry Messenger v6.0.0.90 to their devices. Apparently, there aren�t too many noticeable changes, other than the emoticon next to the chat box being a little bit bigger, and other bug fixes. Keep checking App World for the update, or press Alt and R S T to clear the cache in App World, which may help to push it your way. Let us know if you find anything else new."
I had BBM v6 from the Beta Zone although since I did the latest upgrade on my phone's OS I can't re-download it but in the time I did have it for testing I can't say I noticed much difference between it and the version that's back on my phone now.