Up until today, Windows Insider testers were the only ones who could get builds of the Fall Creators Update for their PCs and select Windows Phones. Starting today, current Windows 10 users can get the Fall Creators Update via Windows Update and/or Update Assistant.
Technically savvy users can proactively grab the final Windows 10 Fall Creators Update bits (Build 16299.15), plus any available Cumulative Updates with fixes and updates to that build, starting today if they want. As it did with the prior Windows 10 feature updates, Microsoft will be staggering this Fall Creators Update feature release, with devices known to have fewer problems getting the new build pushed to them first.
I also asked Microsoft when customers would be able to get the Windows 10 Pro for Workstations edition of the product. Microsoft didn't offer specifics, but I've seen reports that this version is available for download by volume licensees today (thanks @mdreinders).
Regarding how to get this new edition, here's Microsoft's official response (via a spokesperson):
"For customers who are looking to purchase a high-end PC with Windows 10 Pro for Workstations pre-installed, please refer to the OEM for a price quote. For customers who are interested in buying a retail copy of Windows 10 Pro for Workstations, we will provide an upgrade from Windows 10 Home and Windows 10 Pro through Windows Store, following the release of the Fall Creators Update. Upgrade pricing details are not yet available, but we look forward to sharing more details as part of the product availability in the store this fall."
Microsoft officials are saying the hardware requirements for the Fall Creators Update arethe same as they were for the original Creators Update released starting this past April. Microsoft recommends a 1 GHz processor or faster; 1 GB RAM for 32-bit and 2 GB RAM for 64-bit; 16 GB of drive space for 32-bit and 20 GB for 64-bit. For those interested in using Windows Mixed Reality, technical specifications, compatibilitytools and an up-to-date list of PCs badged for WindowsMixed Reality are at www.windows.com/mixedreality.