Photokina announced their show dates for 2018 and 2019. As you probably know Photokina is now taking place on a yearly basis in May. With the next 2018 event being the last taking place in September.
At Dpreview there is an interview with the Photokina manager that explains why we see those changes. What’s clear is that “classic” photography is going to have less of a key role the upcoming years.