DIYPhotography reports that Elinchrom will not be part of the 2018 Photokina show and there is a possibility that Canon, Profoto and other companies may pull out as well.
After Leica decided not to take part in the 2017 PhotoPlus Expo in New York and Photokina announced that from 2018 their shows will start taking place annually, I already "predicted" in June last year that more companies will start dropping out from the major photo gear shows.