More Wii Remote accessories! This image from a UK retail site shows what looks to be near final (though still concept) box art for Samba de Amigo, including a pair of maraca shells. While the box art may change, if it came from official sources, you can expect the shells to be available one way or another.
I must say, though, that those shells don’t look particularly strong around the Wii Remote itself. One strong flick, and that shell could snap off and fly right at the TV. No more Samba…
