According to a story on The Hollywood Reporter, Tim Miller — director of Deadpool — is going to be "developing an adaptation of Sonic the Hedgehog for Sony Pictures". Which is a "a hybrid CG-animated/live-action family film". Miller wouldn't be directing; that honour would go to Jeff Fowler, the director and co-founder of Blur Studios, AKA the trailer guys.
Also onboard as producer is Neal H. Moritz, from Fast & The Furious. Patrick Casey and Josh Miller (Golan the Insatiable) are writing.
"Jeff is an incredible director with strong story instincts", Miller told THR. "The world of Sonic presents the perfect opportunity for him to leverage his experience in animation to bring new dimension to this iconic character."