Not that long ago, toy maker Zappies claimed they were working on toys for an upcoming Sonic racing game. This was after a rumor of a Sonic racing game came out, but SEGA specifically said another Sonic and All-Stars Racing Transformed wasn't in the works. SEGA's comment leaves room for them be working on another Sonic racing title, but something outside of the Sonic and All-Stars universe.
Today the rumor grows, with comment from Diamond Select Toys at the New York Toy Fair. A representative for the company revealed some details on an upcoming line of Sonic merch, and had this to say when asked for more info.
“There are some minifigures […] some come with diorama pieces you’re going to build a race track from the game…“
There you go, yet another mention of a Sonic racing game. Now this could be related to an older Sonic game, but it seems more likely that Diamond Select Toys is working on toys for a new game, just as Zappies claimed.