The demo for the mini-game filled spin-off of Viva Piñata has just popped on Xbox LIVE Marketplace. It a ~970MB download and has this description attached to it:

Partake in family style fun with the Viva Piñata: Party Animals demo! One to four players can compete in a sampling of mini-games and races with your favorite characters from the hit TV show! Get the full game so four players can gather in the family room or play over Xbox LIVE to compete in 40+ mini-games and over a dozen foot races.

[Also see: Viva Piñata: Party Animals gallery]