That information has been there for a considerable time on their Japanese site. Why it took them so long to propagate it elsewhere is anybody's guess (as it's fairly obviously-useful information that they already had the code for).
Oddly enough, this information is
not however available on their New Zealand site (at least not yet).
Even stranger, it appears that the back-end of the US & NZ sites are identical (with
http://store.kobobooks.com/en-US/ebo...vated-by-you-1 yielding the exact same results as
http://store.kobobooks.com/en-NZ/ebo...vated-by-you-1) and the download-options-given available-only-to-US book being distinguished from the download-options-hidden available-only-to-NZ book by a suffix (
http://store.kobobooks.com/en-US/ebo...vated-by-you-1 versus
http://store.kobobooks.com/en-US/ebo...vated-by-you-2).