Board Thread:Sonic Boom/@comment-679780-20160309211420

After this twitter post I'm wondering if Big the Cat will be in Sonic Boom.

Why? Well for starters Big's icon is silhouetted with a ? symbol. Sure it made non-Sonic Boom reference, even suprised Sonichu was mentioned, so I could still be wrong. But still why couldn't just use a pre-existing image of Big the Cat? 