It looks like the latest leak of OS 126.96.36.1991 for the BlackBerry Tour 9630 contained a new version of BlackBerry Messenger 188.8.131.52. From what I can tell the team at CentroBB spotted it and then BBHybrids took it from there. They have extracted the desktop install and created an OTA install out of it to make things easier.
WARNING: These files are not tested and are a beta release. MAKE SURE TO BACKUP your device before trying them. These leaks are not for the faint of heart! Proceed at your own risk!
Desktop install files courtesy of BBHybrids – Megaupload Mirror via BlackBerryMaster
OTA install link courtesy of MrBracht at BBHybrids
Alternative OTA install link courtesy of Nathanix via PocketBerry
Thanks to everyone who sent this in!