Xcode 11.0 Beta 4 was released on 17 Jul 2019 and requires macOS 10.14.4+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_11_Beta_4/Xcode_11_Beta_4.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_11_beta_4_release_notes.
The SDKs it contains are:
- iOS 13.0 (Build 17A5534d)
- macOS 10.15 (Build 19A512e)
- tvOS 13.0 (Build 17J5526d)
- watchOS 6.0 (Build 17R5532d)
The compilers it contains are:
- clang 11.0.0 (Build 1100.0.31.5)
- swift 5.1 (Build 1100.0.257.2)