First off, Pokebank is an app on the eShop where you can store pokemon from X/Y, B/W and B2/W2. (Incase you didn't know) You can also transfer pokemon you stored in the bank to X/Y.
What will you do when it releases/releases again for Japan?
Store pokemon from Gen 5-6 games
Transfer pokemon you legally obtained in B/B2/W/W2
Or be like little Johnny and hack for awesome Pokemon (but look legal so they get through the checking systems
Pokebank has been released! Sorta!