We were discussing somewhere else the difference between Folk and Celtic. We came to the conclusion that they were two different things, so is it possible the US version will be radically different to the UK one?
If not, there goes out the argument of Folk and Celtic being different genres.
I suspect Jon meant the Celtic tracks which only appeared on other version of Odyssey and not on the US version. Focusing on the Celtic theme might be a good marketing plan in America because of the forthcoming Celtic Woman tour. Other than that, it might seem pointless but it is the kind of thing that can happen. As an example, 'The Mummers Dance' was basically a song from Pure but it only appeared on the Australian and New Zealand Special Editions. But it somehow found its way onto the Japanese edition of... guess what?... Odyssey!