I have no clue how pokemon bank worked in the first place but will all Pokemon from this game be able to transfer to X/Y do you think?
Because you couldn't use Download Play with a 3DS game using a DS since you can't play a 3DS game on a DS. They had to use a 3DS app to be able to communicate with the DS games, which has been proven possible by PokÃ©mon Dream Radar. (This is really just my guess, by the way.)
As for transferring... do you mean between OR/AS and X/Y via Bank or trading?
I'd be surprised if that wouldn't be possible.