The original smart ForFour was based on the underpinnings of the Mitsubishi Colt and was phased out due to slow sales. Daimler may not be giving up on the idea of a four passenger smart car, though, and according to Motor Authority, the new ForFour could be a stretched version of the ForTwo, which might make it a bit simpler to produce. The same 3 cylinder engine could be used to power the FourTwo as well, but it may not be powerful enough for the American market when the vehicle is laden with four passengers and some luggage.
We like the look of the ForTwo, but are unsure if it would translate well with four doors. No matter, we'll keep you up to date with any news that we hear.
[Source: Motor Authority]