I wasn't going to weigh in on this particular discussion given how charged up things are at the moment, but Tim articulated my basic thought on this in a very effective and concise way.
To further that point, think about this statement also taken from Steven Wilson's Remixes Facebook page:
Please note that as a rule I can’t talk about projects that I’m involved in (and may even have completed) if they have not been officially announced by the artist and/or record company. And let’s just say that at any given moment there are usually a few of those.
(AFAIK, Yes and Panegyric have never officially said that "Tales" has been remixed and will eventually be released in the expanded format, so even if Steven completely finished remixing "Tales", he would not be able to say so.)
Then, there are these statements regarding specific projects:
One remix project completed some time ago which is planned for issue later this year, is the classic 1972 debut album by Roxy Music.
Remixes expected to be released this year, but yet to be scheduled are; Roxy Music's first album, XTC “Oranges and Lemons”, 2 of Steve Hackett’s early Charisma albums, King Crimson “Beat”, another album from the Yes (official) catalogue, and perhaps one or two others. Further release information will be posted here when I have it.
There are still a few finished remixes that are yet to be scheduled for release (notably 2 more for King Crimson, and the debut Roxy Music album), otherwise the above (the 2015 releases) goes a long way to bringing things up to date with regard to what was done and awaiting release.
All of these posts are there to show how things can change at any given moment, not to mention that Steven Wilson can't control if something is released or how long it takes something to get released. Otherwise, if he did have that power, I'm certain we would have every remix he's already completed out in released form for us to enjoy.
As we have witnessed, certain things can languish (like "Beat" and "Three of a Perfect Pair") while other releases leap up out of nowhere and race to the head of the pack (like "Octopus" this year) so nothing is certain until it's in our hands. Speaking purely from my own point of view, I think the choice of the word "final" was a poor one as I don't think we have seen the end of this series yet, but I also think we may have to wait until next fall (2016) to know for sure.
In the meantime, it wouldn't hurt to buy any of the already released Yes reissues if you haven't done so already...