Yes, ok initially the feeds were stating go and download now but I received the message it was coming out Oct 18. Upon a few refreshes it appears it is available. Being in Canada I was then able to upgrade, my clients in the USA however, still no luck. I noticed on one machine in Canada it was using the Australian server so sending that link to my American clients it worked... if you have troubles just keep trying.
http://gizmodo.com/windows-8-1-review-little-changes-make-a-big-differenc-1446625571