Taycan-based four-door coupe is coming in 2020, previewed by a concept this year.

Hot on the heels of its e-tron quattro reveal, Audi has teased the sporty all-electric concept it plans to show in Los Angeles later this year.

The Sport e-tron GT previews a four-door coupe, set to hit production in 2020. It'll be built on the same underpinnings as the Porsche Taycan, and manufactured near Neckarsulm, Germany.

As the teaser suggests, the car will feature a sloping roofline and long wheelbase. If the Taycan is anything to go by, it should offer more than 400kW of power and around 500km of range.

It's not clear whether the car will be underpinned by the new platform Audi and Porsche are co-developing for electric vehicles.

As we learned last week, the two companies are collaborating on a 'Premium Platform Electric' (PPE) toolkit. The first mass-market EV Audi, the e-tron is built on an electrified take on the Volkswagen Group MLB platform, dubbed MLB Evo.

"It’s really a benefit that we have Audi and Porsche [working together] which are really experienced in making really high end cars to bring the knowledge together, it is very unique and you will never find that comparable in the industry," Dr Ulrich Widmann, head of Audi technical development, told CarAdvice last week.

Come 2025, Audi will have an all-electric line-up comprising 12 models. Four new platforms will be used in total, spanning segments A through D.

Along with the pure-electric range, Audi will expand its plug-in hybrid line-up significantly over the coming years.