I didn't catch it. Is Xcode 11 (beta) available already? Do I need macOS Catalina (beta) to run it? I seem to have missed the crucial information and cannot find it on apples developers pages...
https://developer.apple.com/services-account/download?path=/...
for some reason my account only shows "There’s currently no beta software available for download."
Best-kept secret with direct download links (from apple.com)
>To use the SwiftUI design canvas Xcode 11 must running on macOS Catalina.
Please let us know if you find that's incorrect.