Most of you will know that I like to be ready. In time. Sure. It is still very early, but Apple isn’t sitting still – and neither am I – so here you go. This is the first public sign of macOS 10.13:
What you see here is a (large part) of the CatalogURL for developer seeds. A secure (HTTPS) link (note the green “Apple Inc.”) so this is not some fake link.
I can’t wait to get my hands dirty…
Please. Don’t ask for the full link. There is nothing there for you to download and when you use the new URI, then you won’t get to see updates anymore. Not for important updates like security related issues. Just don’t use it. Next to that. You need to be a registered (paid) developer in order to receive and install the next version of macOS.
Edit: The link I found was 100% accurate.
See also: CatalogURL for macos 10.13 High Sierra