https://www.techradar.com/news/theres-an-apple-watch-pride-face-coming-this-monday

It appears that the latest iOS 11.4 release has confirmed we’ll be seeing a new watch face which supports Pride, likely to arrive at WWDC 2018 on Monday, June 4. 

New strings on iOS state that it is “inspired by the rainbow flag” with “threads of color which move if you tap the display”- Apple has found an innovative way of celebrating inclusivity.