Kazunori Yamauchi hasn't ruled out including motorbikes in Gran Turismo 5, or even making a spin-off game especially for them.
"Or we could consider making a Tourist Trophy 2 as well," he added. Tourist Trophy, which came out for PS2 in 2006, was billed as the "Real Riding Simulator" to GT's "Real Driving Simulator".
Despite having said a few times recently that GT5 is basically finished, and with a Japanese March 2010 release date now set, Yamauchi still won't be drawn on issues like the rumoured three-disc set or track editor.
When asked about the latter, the developer was coy. "Things like that I can't really discuss yet. This can be said about all the GT development," he explained. "Until we're very close to release we won't have a finalised decision on a lot of things."
Interestingly, however, when the interviewer joked that it would make Yamauchi's life easier not having to design all the tracks at Polyphony Digital, he replied: "A lot of the courses we set up, we take a long time fine-tuning the details and building the track, so it would probably be a bit different than the types of tracks the users will set up in the game."
Check out our own Kazunori Yamauchi interview from earlier in the year for more on Gran Turismo 5.