Honda released a teaser sketch of a concept model which they will show off on Gran Turismo 6's Vision series in celebration of the racing game's 15th anniversary.

There's no information other than the teaser pic above, but you can clearly see a barchetta-style body with the profile air-vents behind the doors suggesting a mid-mounted powerplant.

All concepts designed around the theme "Vision Gran Turismo" will gradually be available to players for free via DLC (downloadable content).