Surprise, surprise - Rovio's about to issue the next major content update to Angry Birds Rio early! The Carnival update will be available on the Market shortly (exactly how long, we don't know), and we already have the basic changelog:

  • 15 levels in new world named Carnival Upheaval
  • Blue, the Macaw, can now be used alone.
  • The new hidden fruits are papaya (thanks to everyone who helped us figure this out)

There's several iOS sites that are already reporting on the update, and Rovio stated 2 days ago that Carnival would be coming to Android at the same time as iOS:

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We'll keep this post updated as we learn more.