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Not official but probable...it uses the same engine as the jetta but with quattro.

http://www.caranddriver.com/reviews/hot_lists/high_performance/vw_audi_central/2009_audi_a3_2_0_tdi_first_drive_review

excerpt
The 2.0-liter direct-injection turbo-diesel found under the hood of the A3 we drove was significantly reengineered and upgraded earlier this year. It’s essentially the same unit used in the 50-state-compliant Volkswagen Jetta TDI, and here it makes the same 140 horsepower and 236 pound-feet of torque. In the process of the upgrade, Audi switched from the previously used pump injectors, one for each cylinder, to common-rail fuel injection, in which fuel travels through a single high-pressure rail. The common-rail system allows several injections per cylinder stroke, making it easier to meet emissions targets, and it has the added benefit of being quieter.

The shift to common-rail technology is clearly felt. Whereas the old diesel engine virtually jerked the A3 forward, the new engine is more linear in response. Power delivery is more smooth, and there is noticeably less noise and harshness. On the other hand, a bit of the "kick" is missing; the old engine was crude, but it did feel quicker. This latest A3 diesel takes 8.9 seconds to cover 0 to 62 mph, according to Audi; for comparison, an A3 with the 2.0-liter turbo gasoline-fueled four requires about seven seconds to reach 62 mph, and we recorded 8.1 seconds to 60 mph in the Jetta TDI. A more-powerful 170-horse version of the 2.0-liter diesel is available in Europe as well, and it returns performance closer to that of its gas counterpart.
 

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This would be a no brainer if it's the same engine as the Jetta. And they said no quattro, it would be FWD. Quattro would stay on the A4.
 

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they still have to get the engine certified, crash tested, etc.., I don't think it's just a free pass to bring a car in like that!
 

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Looks likely according to this article:http://www.autobloggreen.com/2008/11/23/audi-likely-to-launch-a3-tdi-in-us/

It makes pretty good sense for Audi to launch a diesel version of its A3 compact hatch here in the States. Since it uses the same platform as the Rabbit and Jetta, the 2.0L TDI is a sure-fire fit behind the A3's huge front grille. In fact, we've driven the A3 with that exact engine a few times already, notably while we were participating in the Audi Mileage Marathon a few weeks ago. Volkswagen has already certified its 140 horsepower oil-burner for sale here in the United States, so that's one more gigantic and expensive hurdle that wouldn't need to be crossed. Popular Mechanics recently sat down with officials from the German automaker and Audi's head of powertrain development Wolfganag Hatz confirmed that an unspecified Auti automobile would join the Q7 on our shores equipped with a diesel engine as early as next Spring. Sounds good to us.
 
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I thought this was going to be about the early jetta:dunno this one's nice too!
 

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It's a strange segment though - hatchback AND diesel? I doubt they want to sell any:D The A4 is the money maker, they would probably sell a lot more of those.
 
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