Is this the article you were talking about? I definitely think the interior will look like that as its like the new Q3 and new A1. Not really a fan of touchscreen only infotainment to be honest (Merc and BMW have both kept their MMI Wheel equivalents) but at least they kept the air con controls physical. Says the S3 will have 325 BHP which sounds about right.
"A new version of the RS3 hot hatchback, featuring a 417bhp engine, four-wheel drive and mild-hybrid fuel-saving technology, will sit at the very top of the A3 line-up when it arrives early in 2021, ready to face rivals including the
Mercedes-AMG A45 and BMW’s M135i."
Not sure why it lists the M135i as a rival to the RS3, its a rival to the S3 and Golf R. 417 bhp would be a minor upgrade but I guess its already enough and mild hybrid could be interesting.
https://www.whatcar.com/news/2020-audi-a3-family-hatchback-everything-we-know-so-far/n19749?utm_medium=EMAIL&utm_campaign=enews bulletin&utm_content=WCAR Enews bulletin - 15.07.19::story1_button&utm_source=20190715
Says this is what the next gen A3 family will look like:
The interior will be like this:
The Saloon like this: