The BlackBerry Messenger BAR file has been extracted from a leaked version of OS 10.2 and is now available for you to install! This BBM version comes with BBM Channels, which is great news if you haven't signed up for Beta Zone yet, as you can now sideload it right onto your BlackBerry 10 device. Keep in mind, I've only tested the app on my Q10 running OS 10.1. If you aren't sure to install on your device, then wait till more info comes out about compatibility.
See our how-to sideload BAR files guide for installation help.
Note: BlackBerryOS.com is not responsible if anything bad happening to your device from installing this file. Install at your own risk!