This early sketch reveals the coupe’s clean lines will be transferred over to the convertible almost unchanged, while the roof is likely to be a basic folding cloth set-up to keep weight as low as possible.
The convertible will be offered with the same 197bhp 2.0-litre four-cylinder engine as the coupe, but the extra weight will mean the 0-62mph time will be slightly down on the coupe’s 7.6-second time.
Toyota has already revealed to Auto Express that prototypes for the convertible are already out on the road, as the firm looks to develop the GT 86 in as many ways as it can.
Toyota is also investigating a hybrid system and ways to increaseits power, although chief engineer Tada-san is hesitant about starting an upward spiral of weight and price.
The new GT 86 convertible is likely to go on sale early in 2014, with a starting price of around £26,000.
Toyota will also unveil the i-Road concept at Geneva, designed as a Renault Twizy-style all-electric model for just two people. The production-ready Auris Touring Sports will also be on the stand, before it goes on sale later this year.