Microsoft has just started rolling out the Windows 10 Fall Creators Update to Windows Insiders on the Release Preview Ring. Build 16299.15 has already been available for Fast and Slow Ring Insiders for a while. If you are on the Release Preview Ring and do not see the update yet, you have to be patient. Microsoft is rolling out the update over the next couple of days to all Insiders.
Next week on October 17, the rollout of the Fall Creators Update will officially start. The update will then be available to all Windows 10 users. Already running the Fall Creators Update? Tell us in the comments what you think about it!