Pokémon Bank is an app, of sorts, that allows players to store up to 3,000 of their Pokémon from X and/or Y. The program was originally scheduled for a late December release and released, but Nintendo removed the app from the eShop service at the last minute and issued a delay.
After a month or so, Nintendo is finally releasing the app outside of Japan.
UPDATE: The service is now live in North America.
Serebii
Link to ongoing discussion
After a month or so, Nintendo is finally releasing the app outside of Japan.
Pokémon Bank has finally gone live in Europe, Australia and New Zealand. This game is automatically at Version 1.1 and it has been announced that the 30 day free trial is redeemable until March 14th 2014. North American release is still unclear.
UPDATE: The service is now live in North America.
Serebii
Link to ongoing discussion