*UPDATE* - And just like that, RIM has pulled the update down due to it not working correctly for some folks. The fix, download a previous version from the BlackBerry Beta Zone and all will be fine. If you have it installed and it is working fine, there is no reason to downgrade unless you really want to.
It was only a few days ago that we saw v188.8.131.52 released to the BlackBerry Beta Zone but now RIM has another build for those who like to live on the edge to test out. Twitter for BlackBerry v184.108.40.206 is now available in the Beta Zone as well.
Since RIM hasn't sent out the notifications fully for this release yet, they've also not updated the changelog for now so you're on your own to dig through some of those. Once the changelog gets posted, we'll update the post but in the meantime if you see anything of note, drop it in the comments.