The image has been published (and already removed) on the Hamagami & Carroll design and brand website. The images were developed with a brand application guide for  “Sonic the Hedgehog franchise related products”. Check out:

The silhouette matches that of the poster already revealed in the film, as well as the logo. However, there is still no confirmation from  Paramount.

https://twitter.com/leonardogirard3/status/1102708169313271808

cursed image of apparently the Sonic the Hedgehog design for the live action movie https://t.co/KfLxHLW6xI pic.twitter.com/l1tfjedS3l

— Wario64 (@Wario64) March 4, 2019

Sonic the Hedgehog has a theatrical release scheduled for November 8, 2019.