As of now, there are two Scion models, the xA and xB. The first is a four-door sedan with sporting aspirations, and the second is a boxy van-like vehicle which the Scion people say "defies categorisation".
Both have already been on sale in Japan for the past two years, where they have done well.
Apart from their rather, um, unique styling, the most notable thing about these cars might be their low pricing. This is an effort on Toyota