The 2019 audi a8 is being reviewed by various outlets, with information available on its prices, ratings, and specs. However, some outlets are also reporting on different model years of the audi a8, including 2015, 2017, 2018, 2020, 2021, and 2024 models. The availability of reviews and information across multiple model years may indicate that the audi a8 has undergone changes over time.