iPhone 8 UPDATE: Apple will unveil it in September event but will launch in late October/early November.
Delay is because of part supplies issues and a change in the back design of the phone caused by the fingerprint scanner location.
Before related post:
IPHONE 7S/7S PLUS FOR SEPTEMBER W/EDGE TO EDGE LCD DISPLAYS. IPHONE 8 DELAYED TO NOVEMBER, DESIGN TO CHANGE.