Xcode 11.4 Beta 2 was released on 19 Feb 2020 and requires macOS 10.15.2+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_11.4_beta_2/Xcode_11.4_beta_2.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_11_4_beta_2_release_notes.
The SDKs it contains are:
- iOS 13.4 (Build 17E5233e)
- macOS 10.15.4 (Build 19E234g)
- tvOS 13.4 (Build 17L5235d)
- watchOS 6.2 (Build 17T5234d)
The compilers it contains are:
- clang 11.0.3 (Build 1103.0.32.2)
- swift 5.2 (Build 1103.2.32.5)