Mitsubishi will unveil two new models at the Tokyo motor show later this month.
The Mirage is expected to be the replacement for the Colt supermini. It will be nearly 20cm shorter than the model it replaces, while the shortfall in height and width will be closer to 5-6cm.
Japanese-spec Mirages are expected to have a 1.0-litre petrol engine with Mitsubishi's Auto Stop & Go (AS&G) as standard, which will help cut emissions and improve fuel economy. With the continuously variable transmission added, it's hoped the Mirage will be able to average 70mpg.
The first Mirage will go on sale in Thailand in March 2012.
The PX-MiEV II concept car will also make its world debut at the show. This mid-size plug-in hybrid is about the same size as the car maker's Outlander, but has a targeted economy of more than 140mpg.
With the combination of a 2.0-litre petrol engine and two electric motors, it's hoped the PX-MiEV II will do more than 800km (500 miles), and around 31 miles in electric-only mode. The car also has the same four-wheel-drive system as on the Lancer Evo X.
The Tokyo motor show starts on November 30.