There’s no real pattern that I’ve been able to tell with
regards to any existing iTunes Store feature. Greece and
Luxembourg are Eurozone countries that already have the full-on
music store but that are excluded. Portugal has the teaser but
isn’t a country where Ping is available (according to Apple
themselves). Only a few of these countries have movie
purchases, rentals and TV show purchases, and only the US has a
limited range of TV show rentals.