Originally Posted By: flacoman
I suspect it's probably a Rotax ...
Nope, it's a totally new design by AVL of Graz, Austria, who engineered the system for Audi. Here's a very similar earlier prototype designed to be fitted into a Mini:
It's common but also kind of ironic that Audi went to an outside contracter since Audi was part of a merger formed by Volkswagen when they bought NSU, for whom Felix Wankel worked when he was developing the rotary engine. It will be interesting to compare Audi's new single-rotor Wankel with the 498 cc 50 hp single-rotor Wankel found in the 1964 NSU Spider.