Just as expected, the final QR characters are being revealed as different colored Yoshis. The latest color to join the group is the Yellow Yoshi. That leaves us with four more colors, with blue, light blue, and the regular green Yoshi already confirmed.
Four colors remain. In the past, we have seen plenty of color variations for Yoshi, including black, brown, orange, pink, purple, red, and white. What colors do you think will make it into the game? Comment and let us know!
Source: Mario Fan Site