Unfortunately guys, that is most likely not going to happen anytime soon. The Diancie will probably be released in a few months unless they have some agreement with Nintendo to not release the edit until it distributes it worldwide through GameStop, etc. like they normally do with their movie release events.
It really is hard to tell if or when the others will be released. For all we know, the other content could have been inserted in anticipation for a third version of the game to be released in the future. Nintendo has yet to even hint at the existence of anything other than Diancie outside of blocking trading of the unreleased Pokemon/items. Right now, the best that we have on the front of redistributing the unreleased content is through ROM save swaps using a modded 3DS (Gateway/MT Card.) It's not perfect by far, but that is all we have for now.