Mii Freestyle is essentially a very basic training mode, where users can either learn how to play the game or just jam freestyle. You can also import and play as your Mii characters.
Guitar Hero: World Tour will feature a bunch of songs from European artists. Bands include Tokio Hotel, Radio Futura, Oasis, Lost Prophets, Hush Puppies, Anouk, Beatsteaks, and Kent, with even more bands promised as well. The songs will be released as downloadable content, but pricing details weren’t given.