The German firm previously confirmed the Q4 would be produced in 2019 at its plant in Győr, Hungary.
It will be part of a growing line-up of style-led SUVs, spearheaded by the electric E-tron and range-topping Q8.
The Q4 will sit on the same MQB underpinnings as the second-generation Q3. It is scheduled to arrive in showrooms in summer 2019 at a base price of around £28,000.
With the Q3 having grown in size in order to provide space in the range for the Q2, the Q4 looks set to be larger than its closest rivals. Audi insiders have revealed to Autocar that it will be at least 4500mm long – slightly longer than the Q3.
Plans for the Q4 were originally revealed by Audi in the form of the TT Offroad concept, which first appeared at the 2014 Beijing motor show.
Inside, the Q4 is set to benefit from a range of developments already under way at Audi and parent company Volkswagen for inclusion the next generation of MQB-based models.
These include full-HD instrument displays, gesture control functions, a 9.2in touchscreen, wireless smartphone charging and the latest connectivity features.
Among the engines earmarked for the Q4 is a new generation of 1.5-litre four-cylinder turbocharged petrol and diesel units and updated versions of today’s 2.0-litre four-cylinder petrol and diesel engines, as well as an all-new 2.5-litre five-cylinder petrol unit with up to 400bhp in a range-topping RS Q4 model.
The new Q4 line-up will also feature a petrol-electric plug-in hybrid Q4 e-tron model with an electric-only range of up to 31 miles, as prescribed by China’s green vehicle regulations.
Audi Q8 SUV: Range Rover Sport and BMW X6 rival launched
Audi E-tron: brand's first full electric model to cost £70,805
New higher-spec Audi Q3 to cost nearly £3000 more than predecessor