WWDC 2018 takes place June 4 to June 8 in San Jose, California.
First Alleged Part Photos from iPhone 5S and iPhone 6 Surface
Photo of claimed iPhone 5S and iPhone 6 speaker enclosures with iPhone 5 part superimposed
It is of course impossible to tell for certain whether the parts are indeed legitimate and whether they are intended for the upcoming iPhone models as claimed. Nowehereelse.fr has published a number of accurate photos in the past, but typically obtains the photos by scouring web postings from Asia and thus the photos typically come from a variety of sources that make it difficult to determine their reliability.
Edge view of claimed iPhone 5S and iPhone 6 speaker enclosures