Subaru International showcased their latest 2008 Subaru Impreza WRC Concept at the Frankfurt 2007 autoshow. Autoblog reported "The Concept Car, based on the new Impreza, conjures up images of future styling trends for a world rally car.", no technical specifications were announced. Anyhow they speculated it will be the same 2 litre engine on revised drivetrain software AWD rally machine.
To refresh our memory, here is the post about Subaru Impreza WRX STi.
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Source: Autoblog