Microsoft officially announced October 17 as the Windows 10 Fall Creators update release date. Now, with Windows 10 Fall Creators update reaching RTM stage with Build 16299.15 it is expected that the official update will start appearing in official resources.
And it seems that Media Creation Tool is already offering Windows 10 Fall Creators update RTM Build 16299.15. You can check the ESDs available in Media Creation Tool by clicking on the link posted in the tweet below.
You can check our tutorial on how to use Media Creation Tool to update to Windows 10 Fall Creators update and create Bootable USB by clicking here.