Snipped from channel4.com - Hopefully it will available in the States in 09 or 10.

Subaru has one more turbocharged Impreza to come, too: its first diesel. The tiny company has developed its own in-house diesel engine, following the same flat-four cylinder layout as the petrol engines, and mainstream versions of this 2.0-litre unit developing about 150bhp will go on sale late 2008. This engine will also feature in the Legacy, Outback and Forester ranges - and a high-performance version is under consideration for a diesel Impreza WRX.