An interesting article in the link below, explaining the merits of this engine vs. the 1.4L predecessor. One has to wonder for the states whether or not the 1.33L would be a better choice than the Yaris 1.5L engine that is continually rumored for the states. From a packaging standpoint, the iQ has been designed with the 1.33L engine in mind, along with a relocated differential. I'm not certain the current 1.5L would even fit into the iQ. Hopefully we'll know something definitive soon.