I was asked for more information about the forthcoming Subaru boxer diesel and I found this, originally from Newspress UK.

Never one to follow the herd, for years Subaru has built cars that are just a little different from typical automotive fare. The 1989 Justy employed the first CVT transmission in a U.S. production car, and the exotic styling of the 1992 - 97 SVX still turns heads today. Now to promote the first ever boxer diesel engine offered in a passenger car, a Subaru dealer in the UK has created a special “see-through” Outback that shows off the automaker’s mechanical innovation to the world.
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Subaru will be launching their 2.0L four-cylinder diesel following the Geneva auto show, offering it as an option in its Legacy and Outback models. Unfortunately, it will be at least 2 years before we see it in the States. Further insult to injury is that we will most likely not be able to get the five-speed manual that is being designed specifically for the diesel. Instead we will have to wait for the automatic that is currently being developed.

Oddly enough, though the engine is built in Japan, it will not be available to the Japanese until after the US launch.

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.