Now one step forward, Microsoft has shipped 16299.15 to the release preview ring. A Twitter post by the Windows Insider program confirms the same:
Heads up #WindowsInsiders in the Release Preview ring: We have begun releasing Build 16299.15 to you. https://t.co/dtMEgmoqxy
— Windows Insider (@windowsinsider) October 10, 2017
Microsoft has updated the original blog post with the following announcement:
As part of final preparations for the general availability of the Windows 10 Fall Creators Update on Oct. 17th, we have begun releasing Build 16299.15 to Windows Insiders in the Release Preview ring. If you are in the Release Preview ring and don’t see this build offered yet – be patient as it will be rolling out over the course of the next few days to everyone in the Release Preview ring.
The original blog can be found here.