Both three- and four-cylinder engines are on the way ranging from 1.0 to 1.4 liters. The Junior is predicted to get a three-cylinder, but Opel hasn't confirmed that or even if the Junior will be the first car to get one of the co-developed motors. Automotive News reports that the engines have "direct injection and turbocharging capability," but with double-digit gains in fuel economy and torque out of the box, those features might not appear immediately.
Above that, there will be 1.6-liter diesel and gas engines to replace current units, perhaps like the 1.4-liter in the Opel Insignia. GM says those engines will come to the U.S. "within two years."
The three-door Junior will be smaller than the Opel Agila (pictured), a challenge to the Mini Cooper and Audi A1. An electric version is a possibility for 2015.