Forza Motorsport 5 brought the series back to its vanilla racing roots, but fans of Forza Horizon can hold out hope for a return to the unusual open-world racer formula seen in the previous outing.
IGN turned up a couple of images posted by a concept artist Sumeet Surve of Dhurva Interactive, a studio which has produced concept art for every Forza game to date.
The images are titled Forza Deep South and show what looks like a Louisiana-inspired environment.
Microsoft refused to comment with the usual “rumours and speculation” line, and Surve has not responded to queries either.
Although the artworks may well be unused concepts for Forza Horizon, speculation is rife that developer Playground Games is working up a sequel.
Playground Games is known to be working on an unannounced Xbox One game.