Rapper Hunnid-P, the person behind the Knuckles’ theme in Sonic Adventures 2 has stated that he is working on a Knuckles’ theme for an upcoming Sonic project. Here is what he said:

“I’ll have some new Knuckles music as soon as Sega and I work on this new project for Sonic so stay tuned!”

This goes along with the news earlier that multiple website domains were registered for Sonic Adventures 3. This adds more weight to this game being real.

Source: mynintendonews.com