I got this puzzle too a few days ago. I'm not sure why it is so difficult to find, maybe because it is only recently released. Even the rubiks.com homepage doesn't mention it, yet!
Guess what? I have just added a page to my site about the Rubik's Rings. I think my solution is better than the one in the booklet supplied with the puzzle.
By the way, does anyone have a good picture of the puzzle I could use?
Jaap's Puzzle Page: http://www.org2.com/jaap/puzzles