iOS 15 goes live on September 20 along with iPadOS 15 and watchOS 8 - GSMArena.com news
Here is another look at iOS 15 beta 8 (Video) - Geeky Gadgets
Apple Hub on X: "According to iPhoneSoft, iOS 15 will be compatible with all iOS 14 compatible devices except for the iPhone 6s, iPhone 6s Plus and the 1st gen iPhone SE