Well, I knew those Rhino reprobates where up to something. I've been putting off buying the new Yes boxed set for this very reason.
Rhino is re-releasing Yes' entire catalog, super-remastered, with bonus tracks, four discs at the time. These bonus tracks, for now, consist of earlier versions and demos of Yes classics, including the demo of Roundabout, etc. I'm sure that some other "previously unreleased" tracks that SHOULD HAVE BEEN on the box set will pop up on these re-releases. So, the rebuying will begin. Now, I've got to go sell all my Yes albums and buy the new ones - not exactly a profitable thing. Yes, I am excited about the demos. Yes, I am ticked that the record business knows how to pick our pockets, and that we let them. They should just release a four disc set of demos and stuff, and I'd buy it the day it came out.
Anyway, here's the official annoucement:
http://www.yesworld.com/
second link