The much talked about “Update 1” which is actually called “Update” (and can be thought of as Service Pack 2, after the big GA update) is out via Windows Update. And that’s it. You won’t get this update via WSUS, and downstream products.
And that’s because there’s a problem.
I applaud Microsoft for taking the following action to avoid breaking security patching:
Microsoft plans to issue an update as soon as possible that will correct the issue and restore the proper behaviour for Windows 8.1 Update scanning against all supported WSUS configurations. Until that time, we are temporarily suspending the distribution of the Windows 8.1 Update to WSUS servers.
So if you’re desperate for The Update then you can manually download it via Windows Update but forget about deploying it in business for the time being until Microsoft resolves the WSUS SSL issue.
BTW, if you are using Veeam to backup WS2012 R2 hyper-V then MVP Hans Vredevoort has important news of a hotfix from Veeam that you should read before approving The Update.