The Wii version will come packaged with an Elmo "gameplay helper", a soft plush cover for the Wiimote that hides unnecessary buttons from the preschool player's busy fingers. The DS version comes with a special stylus.
A press release describes the game:
“In Sesame Street: Elmo's A-to-Zoo Adventure, kids head to the zoo with Elmo, Zoe and their animal friends, as they explore games based on a variety of literacy skills, including letter identification, letter sounds and word families. Kids can also explore exciting zoo habitats including the Aquarium, Savanna, Jungle, Wetlands and the Arctic."”