(https://www.sonicstadium.org/wp-content/uploads/2021/04/sonic_movie_set_knuckles-895x375.png)
There are also rumors of GUN appearing on the movie.
The plot seems to still revolve on the human world, I was kinda of hoping we get to explore more of Sonic's world.
More deets here:
https://tailschannel.com/sonic-the-hedgehog/sonic-tails-and-knuckles-prop-sighted-during-filming-for-sonic-the-hedgehog-2/