Windows 10 version 1803 build 17023 for PCs is now going through internal testing. The new Redstone 4 Update build 17023 (10.0.17023.1000 rs_prerelease.171018-1441) was compiled on Oct 18, 2017.
Windows Insider team has canceled the release of Redstone 4 build this week. A new build will roll out next week for Fast and Skip ahead Insider members.
Windows 10 Redstone 4 update build 17017 was released last week with new Cortana features including Cortana Collections and more. Also, there were bug fixes and improvement to the OS.
Windows 10 version 1709 (Fall Creators Update) is now available for everyone. You can now download official Windows 10 Fall Creators Update ISO from here. A new cumulative update KB4043961 (OS build 16299.19) is also available for end users. The update comes with bug fixes and minor improvements.