From the press release –
New BlackBerry PlayBook OS 2.0 features include:
Integrated email client with a powerful unified inbox: With BlackBerry PlayBook OS 2.0 you have the option to use a unified inbox that consolidates all messages in one place, including messages from Facebook®, LinkedIn® and Twitter®, as well as personal and work email accounts.
Social Integration with Calendar and Contacts apps: The built-in calendar harnesses information from social networks and makes it available where and when [...]
