The Binding of Isaac: Rebirth is due to get a significant expansion which will hit the Vita sometime in 2015, it has been revealed.
Developer Edmund McMillen announced the changes on his blog, stating that he has created a new design document including a new game mode which will almost ‘double the amount of things you can do.
The expansion will contain new enemies, bosses, new areas, endings and a new playable character.
If you want the chance to design a new item for the game you can, as McMillen has asked players to submit item ideas. See this reddit link for further details.