Unless there's been an unannounced rule change, you still have to have the ticket "issued" in the country of origin. If you have the AA RTW desk in the U.S. issue the ticket for you, you'll pay the U.S. price, not the country-of-origin price. The fact that the ticket is electronic doesn't change that.
When the online ticketing facility gets going, that may well change (and it wouldn't make any sense for it not to change). However, what will happen to prices at that point is unclear.
Star has already removed the "pay-the-higher-of-country-of-origin-or-country-of-purchase" rule from their RTW tickets, without any drastic effects (yet) on pricing. Probably the people flying halfways across the globe to begin an RTW in a country where the tickets are cheap are still a small minority.