One of them is the upcoming and recently caught by spy our photographers smart fortwo, while the other concept will preview the original forfour successor.
Said to make use of the recent Mercedes-Benz/Renault-Nissan collaboration, the new fortwo (codenamed C453) will use a Germanic-French-sourced three-cylinder gasoline engine, developed in collaboration between the two manufacturers.
With around 0.9 liters of displacement, direct injection and a choice between natural aspiration and different levels of turbocharging, the entirely new three-pot mill will be the only type of internal combustion engine available for the third generation of the fortwo, with the diesel alternative being switched with the full-electric e-drive version.
Autocar says that the engine will develop around 65 hp in n/a form, with 85 hp and 105 hp turbocharged versions higher in the range. The electric e-drive version will offer around 90 hp.
As far as the new forfour (codenamed W453), it will share its platform with both the fortwo and the future Renault Twingo, and it will also be previewed by a concept at Frankfurt.
Since it will have to offer space for... surprise!... four passengers, the next forfour will be 820 mm longer than the fortwo, while having a projected total length and height of 3550 mm and 1701 mm, respectively.