Smart is planning the release of its next generation ForTwo city car. Our spies captured images of a concept version being transported inside a factory in Germany. The new model will also form the base for a stretched version called the Smart ForTwo+2. The Smart ForTwo+2 will have rear doors, making access into the tiny rear somewhat easier. An additional model would make the Smart range a bit more competitive with city cars such as the Chevrolet Spark and Kia Picanto.HYBRID AND ELECTRIC POWERBoth new Smart cars will remain rear-wheel drive, keeping the engine below the floor of the boot. The added length for the back seat in the four-seater will come from an elongated wheelbase. Although currently unnamed, it is rumoured to retain the ForTwo+2 moniker. The new model will be Smart's first four-seater since the failed Smart ForTour. The new cars will be available with several engine options, including a hybrid and perhaps even a full electric motor.