Via BerryReview:

Enhanced Media Key Events

• It is now possible for BlackBerry device applications to respond to key presses of "media" keys even when the BlackBerry device application is in the background. This allows a BlackBerry device user to control media playback using certain keys even while another BlackBerry device application is in the foreground.

Multiple ContactList Support

• New API supports multiple Personal Information Management (PIM) data sources. It allows third party developers to use existing PIM APIs to access and query each individual address book on a BlackBerry smartphone

PhoneScreenField

• Enables third party developers to customize incoming and active call screens by adding static text or images to the lower half of those screens

Multi-line API (Multiple Phone lines)

• Multiple cellular and PBX lines are now available on BlackBerry smartphones. Third party applications can access the various phone lines, retrieve corresponding phone numbers, invoke the phone app and have it use a specific phone line, etc.

Video Capture

• Allows BlackBerry device applications to embed a viewfinder, record video clips and display
  them within the viewfinder using the functionality specified in JSR 135.

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