Petapixel is not the only website saying the next photokina will be in May 2020:
https://www.fujirumors.com/photokina-2019-cancelled-coming-back-in-may-2020-and-looking-back-at-photokina-2018-with-fujifilm-x-photographers-live-stages/
https://www.dpreview.com/news/2039349796/photokina-2019-gets-postponed-will-become-an-annual-event-starting-may-2020
Okay, FujiRUMORS might not be the best source, but DPReview as well. Also, if we would countercheck all news here, we'd be very busy... I think, Miro deserves an apology
https://www.fujirumors.com/photokina-2019-cancelled-coming-back-in-may-2020-and-looking-back-at-photokina-2018-with-fujifilm-x-photographers-live-stages/
https://www.dpreview.com/news/2039349796/photokina-2019-gets-postponed-will-become-an-annual-event-starting-may-2020
Okay, FujiRUMORS might not be the best source, but DPReview as well. Also, if we would countercheck all news here, we'd be very busy... I think, Miro deserves an apology