Just got word from @cmwdotme that the DingleBerry Jailbreak v2.1 Beta is now live. What does this mean? It means that all firmware versions on the PlayBook can now be rooted. Here are a few words of advice from Chris Wade himself:

Dingleberry 2.1 beta is live. Run this BEFORE upgrading to 6067. Login via devuser and run /tmp/setuidgid root /bin/sh to gain root.
Once you confirm you have root then you can upgrade to 6067 and do the same to gain root. Enjoy.. All firmwares are currently jailbreakable.
If you already upgraded to 6067 then downgrade using my previous post and run Dingleberry 2.1 then upgrade again.
Warning: This download is for experienced users only and is in beta. So please download with caution.