Forza Horizon developer Playground Games may be working on another next-gen Forza title, according to a team member's LinkedIn profile.
Yibo Liu, a vehicle technical artist at Playground, revealed on his LinkedIn page that since January 2013 he's been "working as the only technical artist in the vehicle art team for an undisclosed next-gen Forza project."
This has since been changed to simply: "Working as the only technical artist in the vehicle art team for an undisclosed Xbox One project".
Forza Horizon, developed by Playground, was the only Forza game not handled directly by Turn 10, so speculation naturally suggests Playground would be working on a sequel to Horizon.
This past July, Playground was seen advertising for new staff on what it described as a "visually stunning", "genre-leading" racing game.