Apple has pushed out the fourth beta versions of iOS 11.1 and watchOS 4.1 for developers. The public beta versions should be made available soon. Apple’s iOS 11.1 beta 4 update brings the 3D Touch multitasking app switcher, hundreds of new emoji from Unicode along with bug fixes and performance improvements.
The build number of the iOS 11.1 beta 4 version for developers is 15B92. For the watchOS 4.1 beta for developers, the build number is 15R846. The latter update adds Apple Music to the timepiece, along with the ability to stream radio stations, including Beats1, over LTE.
If you are a developer you can check the update by going to settings–> General–> Software Update.