Audi is in the process of developing a mid-cycle update for its E-Tron and E-Tron Sportback electric SUVs, and a prototype has just been spotted. The prototype is for the updated E-Tron Sportback, but most of the changes seen here will also end up on the updated E-Tron, which is also out testing. The E-Tron arrived in 2018 as a 2019 model, with…