Audi has released another new teaser for its coming e-tron quattro concept - expected to wear a ‘Q6’ badge - ahead of an unveiling scheduled for this month’s Frankfurt motor show.

The company has released a number of illustrations for the concept in recent weeks, following earlier reports and later confirmation of plans for a new all-electric SUV that will do battle with the coming Tesla Model X.

This latest sketch, although less detailed than renderings handed down in August, offer a look at how Audi’s designers conceptualise new models before arriving at the fully realised end product.

As those earlier illustrations reveal, this latest sketch hints at a sharpened design for Audi’s electrified ‘Q6 e-tron’, which is expected to be positioned as a large sporting SUV between the mid-sized Q5 and the big new Q7.

Developed from scratch as an electric vehicle, the e-tron quattro concept’s design promises lightweight and efficient motoring, helped by a record-setting drag coefficient value of just 0.25 - outdoing even the BMW i8 for slipperiness.

Audi says that this, along with an advanced electric drive system, will give the new SUV a Tesla-challenging driving range of around 500 kilometres.

Audi e-tron quattrogreen

The concept is expected to be followed by a production version in late 2017 or early 2018, and Audi’s Australian arm has confirmed its interest in a local debut.