Research In Motion has officially released OS 188.8.131.528 for the BlackBerry Playbook. But this update has been pulled RIM has commented to why the sudden withdrawal.
RIM had this to say:
RIM discovered an issue with the PlayBook software 184.108.40.2068 update. The update has been removed. Customers that have already successfully updated to version 220.127.116.118 are not affected and can continue using their PlayBook with the updated software.
After looking into the issue a vulnerability found within Adobe’s Flash Player. If you read through the Knowledge Base Article you will see that the vulnerabilities may be the culprit in its release. Let us know what you think and well keep you updated on when it will be available again.