To everyone’s surprise, Apple released iOS 13.1 Developer Beta today. Apple usually releases Betas for .1 updates after the final version has been released. This beta is probably beta 9 and may have been accidentally renamed.
One reason for this maybe the accidental release of the actual iOS 13.1 Developer Beta which may have been only for the Apple employees.
This Beta may introduce the long awaited Audio sharing feature.
Along with this Beta, Apple also released WatchOS 6 Beta 9 which is correctly labelled.