Here's what we know:
* Sonic Riders: Zero Gravity was the last game in the series, released in 2008.
* While there have been occasional hints and mentions of the series by SEGA, nothing concrete has been confirmed.
* The Sonic franchise is constantly evolving, so it's not impossible that a new Riders game could be in the works.
* However, with so many other Sonic projects in development, it's difficult to say when or if a Riders revival will happen.
Keep an eye out for official news and announcements from SEGA! You can follow their social media channels and official website for updates.