Audi has announced plans to unveil the A7 Sportback h-tron quattro concept tomorrow at the Los Angeles Auto Show.

Audi has announced plans to unveil the A7 Sportback h-tron quattro concept tomorrow at the Los Angeles Auto Show.

Described as a "technology demonstrator", the concept will feature a plug-in hybrid system featuring a hydrogen fuel cell setup. No further details are available at this point but we will have all details tomorrow at 6 PM (CET) when Audi will kick off the press conference.

Also at the Los Angeles Auto Show, Audi will bring the Prologue concept which has already been teased several times while official design sketches hit the web this past weekend. It will be Audi's first show car to be styled by the firm's new chief designer Marc Lichte and promises to feature "an interior and exterior to redefine the benchmark."

At Audi's stand in Los Angeles, visitors will also get to see the third-gen TT family, facelifted A6 & A7 lineups and the R8 competition.

Note: Audi A7 Sportback 3.0 TDI competition pictured

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Audi A7 Sportback h-tron quattro concept announced, debuts tomorrow