Almost all of the developers for mobile games and apps (iOS, Android, etc.) launch in New Zealand first due to the time zones. Usually by 11 pm the night of NZ launches, the U.S. gets the game, too. Most games start in NZ and spread through other regions as the time zones catch up. This is almost always the case with apps, especially with big name developers or household brand name developers. Also many games and apps are released much earlier, sometimes 2 years or more, in different Countries. A great example of this is Star Wars: Force Arena which requires the Australia region.
Some hardcore gamers use multiple iTunes accounts attached to different regions to be one of the first to test out or try new games long before they are released in the actual regions they reside in. Reddit user Excuse_my_GRAMMER posted this regarding having multiple iTunes accounts: