This is the "Sonic the Hedgehog Movie Novelization".
Somtimes movies that people feel will be popular get a novelization...and...here comes hollywood with this book. The front says "now a major motion picture". Items like this are pretty common when the movie isn't based on a book already. This follows their pattern, with 1 character on the cover and a non-revealing background that's non-specific on purpose. (Can't be a spoiler)
This was released on pre-order in late January 2020, because the movie date is Feb. 14, so that no one can 'beat the street date' and get it early to spoil the plot or use the book to skip the movie. The cover does have the updated design, and the removed product placement 'nike' off the shoes so it doesn't look as much like a screaming ad gimmick.