Well here's a fun one - a new leaked OS has popped up today for the BlackBerry PlayBook. It was certainly unexpected but still very welcome. Most PlayBook users didn't expect a new OS I'm sure so anyone that is looking to tinker around a bit will want to give this one a go.
While this is a full OS there is nothing super new but it's said to have some speed improvements which is good to hear. The method for installing is the same of that for BB10 devices so you'll need to use a Windows PC to run the autoloader. Be sure to perform a full backup before you dive in and don't hold us responsible if anything breaks.
Head to the forums for full details and instructions and be sure to leave a comment with any findings.