I guess since pictures got leaked Audi had to make a press release about it. There’s an entire section devoted to the TDI down the page.
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The new Audi A5 / Audi S5
Audi is launching a fascinating new model series for its entry into a highly emotionally charged segment of the market: the A5 successfully unites the acclaimed Audi design language and thrilling dynamic driving performance, and combines generous refinement with the brand’s characteristic quality and sophistication. Its progressive design gives the new coupé an appearance that is both elegant and dynamic. With its muscular FSI and TDI engines, its entirely newly developed high-precision running gear, and a raft of innovative, luxury-class equipment features, the Audi A5 has been crafted to be a modern grand tourer, a touring coupé in the best tradition.