Via the CrackBerry Forums thanks to user DetectiveBerry, it looks like the installer for Facebook 1.5 has found its way online. To install you’ll need to run through the desktop manager, and for now the installer works for BlackBerry devices running OS 4.6 only. To download the installer you can head over to this thread in the CrackBerry Forums where you’ll find the installer .zip file.
Be sure to let us know if you do install, and if you run into any issues. Should be interesting to see what changes and improvements have been worked into Facebook 1.5 for BlackBerry.
[BerryReview via CrackBerry]