Research in Motion has released a new beta update of Playbook OS 2.1 for the users who have registered for it. This is a solid update with a bunch of new functionalities:

Improved HTML5 support
Portrait support for Email, Calendar and Contacts
Improved folder support including IMAP folder support
Full device encryption is now supported, so that the whole device and personal partition can be secure.
Screenshots are now saved in lossless PNG format.
Each Android app will now run in its own window. This greatly improves the user experience and consistency among the other application runtimes.
Access to the Camera hardware is now supported for Android apps, allowing many more application types to work on the BlackBerry® PlayBook™ tablet.
In-App Payment is now supported through the BlackBerry Payment SDK, so Android applications can include virtual items for sale in their applications.