https://www.techradar.com/news/windows-10-october-2018-update-could-be-soon-ready-for-release-going-by-latest-preview

Microsoft has deployed a new preview version of Windows 10, and this latest build could be the release candidate of the OS, at least going by the fact that no new features are introduced whatsoever, along with some slight changes in the phrasing of the related blog post.

Build 17763 for the imminent October 2018 Update (Redstone 5) has been pushed out to the fast ring, and as mentioned there are no new introductions at all in terms of functionality, just some slight tweaks and adjustments to the operating system.