So yeah, there' s a challenge too. You'll be surprised to learn that it requires the two tribes to retrieve stuff from the water. They dug up this rarely-seen gem to silence all you doubters who thought they shot their creativity wad (puzzles!) on the RC. Hoo... rah? Oh yeah, and Aitutaki wins.

   Update: The weekend TV ads clearly show Probst tossing the bottle around, with Aitutaki dressed for the water challenge (below). Aided by the discussion at MeSS (particularly Outfrontgirl's geographically-aware observations that the IC can be differentiated from the other beachfront challenge by the islands visible in the background), it appears that Ozzy had a shirt on for the pre-challenge pep talk. That suggests that the new footage of Probst tossing the bottle to Rarotonga (past a wet-looking, shirtless Ozzy) is meaningful, because it's after the challenge. Or you could just base that conclusion of off, as VolcanicGlass points out, Yul's holding the immunity idol when Probst throws the bottle. All leading to the same conclusion: Aitutaki wins, Rarotonga gets stuck with the bottle.