iOS 13 developer beta is available as of now but it is just limited to paid Apple developers. iOS 13 public data was released in July while the iOS 13 golden master will be the released one week before the final iOS release. The official iOS 13 released date is about one week after the next iPhone launch event on September 10.
iOS 13 compatibility List
Apple Will Support IOS 13 For iPhone 6s 6s Plus and So on with the Further Devices Specially the iPhone 11 Pro You can check which phone is supported for the IOS 13.
Coming to the features comings to iOS 13 include the dark mode. In iOS 13 the Dark mode will be system-wide, it will change hues from bright white and light grey to black and dark gray.
For More About Apple You can Watch The Apple September Event
Apple Special Event
Live from the Steve Jobs Theater.
September 10, 2019 at 10 a.m. PDT