2018 is the final year for Official Audi in the WRX. Dieter Gass, Head of Audi Sport is focus in the DTM and Formula E.

"We are involved in Formula E so we already do have a programme in electric motorsport, even though we were very interested in the EWRX, [but] at the end of the day it came very much down to a choice between DTM and EWRX" said Gass to Motorsport.com

With this withdraw from Audi with Mattias Ekstrom’s EKS team’s in 2019, Dieter Gass said “I really appreciate the work we have done with Andreas and his performances we have seen,” 

“If there is anything we could do, I would love to carry on working with him.” Still the WRX has 5 rounds left “( ... ) We carry on developing and we go full pull until the end of the season, I do still hope we manage to win a race or more races until the end of the season.”said Gass to Motorsport.com

in http://www.motorsport.com/world-rx/news/audi-to-end-world-rallycross-programme/3167987/?nrt=210