Xcode 10.2 Beta 2 was released on 4 Feb 2019 and requires macOS 10.14+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_10.2_Beta_2/Xcode_10.2_Beta_2.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_10_2_beta_2_release_notes.
The SDKs it contains are:
- iOS 12.2 (Build 16E5191d)
- macOS 10.14.4 (Build 18E184e)
- tvOS 12.2 (Build 16L5191d)
- watchOS 5.2 (Build 16T5191d)
The compilers it contains are:
- clang 10.0.1 (Build 1001.0.37.9)
- swift 5.0 (Build 1001.0.60.3)