RIM has just released the Developer beta registration page. If you would like to try the new beta OS you can register your PlayBook’s PIN here https://developer.blackberry.com/devzone/register there seems to be an issues that they are pulling non SSL content throught a SSL site but just ignore the error and load the content.
I have heard of issues that have prevented people from getting the update. If you experience issues please reset your playbook by holding the power button and selecting reset, then once rebooted register again. The update was intantly available for me when I did this. Others are complaining that they get a red x beside the PIN box even though their PIN is proper.
If you have any issues please post your issues to the following BlackBerry Support Community forum http://supportforums.blackberry.com/t5/Testing-and-Deployment/Playbook-2-1-0-Beta-Released-Post-Findings-Here/td-p/1742577/page/3
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