Rumors are spreading that Microsoft and Rare will show Rare's next game tomorrow at an Microsoft expo, and now this image was put up on a blog from the people behind the expo. Could this be Viva Piñata, rumored to be the new Pokémon? Update: Rare and Microsoft just announced Viva Piñata.
First info up at official website. Update #2: First images added. Update #3: Another batch of images added. Release date is upcoming holiday.
Update #4: Added the promotional video presenting some of the pinatas, and a few seconds of the game at around 3 minutes.