Rumors have begun that AudiAudiGermany, 1909 > present83 models
8213 photos
27 videos
is working on a diesel hybrid supercar that will take on the upcoming raft of supercars from PorschePorscheGermany, 1931 > present43 models
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, Ferrari and McLarenMcLarenUnited Kingdom, 1963 > present92 models
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.

Lending this rumor more credence is that after Autoexpress wrote about the rumor, Audi's official Twitter linked to it and copied the quote, "If we make this car it will be the absolute best supercar." That is obviously not official confirmation, but it makes this rumor much more interesting. 

"If we make this car it will be the absolute best supercar, and completely different in concept to the R8. It will be very Vorsprung Durch Technik, very innovative," said Franciscus Van Meel, boss of Audi Quattro GmbH, Audi's performance division. 

The company wants to bring its Le Mans-winning technology to the road as a halo car. It is similar to what it did with the racing R8Audi R8Germany, 2000 > 20057 versions
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and road going R8Audi R8Germany, 2006 > present44 versions
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but an even more radical step because no one has mass-produced a diesel supercar. 

Van Meel said that the car would be better than the McLaren P1

Audi has experimented with a diesel supercar in the past. The R8Audi R8 V12 TDiGermany, 2008 > present2 photos
had a Le Mans concept that used a V12 TDI, but it was never produced. 

The new car would have even more performance than the R8 and take on the Porsche 918, Ferrari EnzoFerrari Enzo FerrariItaly, 2002 > 20044 photos
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-successor and McLaren P1McLaren P1United Kingdom, 2012 > present3 photos
, all of which are either rumored or confirmed to be hybrids. 

Source: Auto Express