It looks like BlackBerry Bridge, the application that allows you to Bluetooth tether your BlackBerry smartphone to your BlackBerry PlayBook, has been updated to v1.0.6.5. If past history is at all indicative of what is going to happen next, an update to BlackBerry Tablet OS, the software that runs on the BlackBerry PlayBook, is imminent.
You can pick BlackBerry Bridge v1.0.6.5 up in BlackBerry App World.
Is is just me, or, does tethering seem to be a bit faster?