https://dtm.com/en/news/dtm-and-supe...018-06-23.html
The new “CLASS 1” regulations for DTM and the Japanese SUPER GT series have been completed.
The first joint two joint races will happen in 2019, one race in Europe and one race in Japan.
DTM will run to the new regs next year, but Super GT will only really begin using the new regulations from 2020.