Sega held a livestream recently where they hosted artist Tyson Hesse, the guy behind the opening animation of Sonic Mania.
In the livestream recording (thanks, Nintendo Everything) they talked up the process behind making the animation, and they even provided a super early look at the animation.
Sonic Mania is currently available for PC, PlayStation 4, Xbox One, and the Nintendo Switch. In case you missed it, you can find my review for Sonic Mania here (I absolutely love and recommend the game!).