^ Is it just a case of having the new blocks available to harvest, or are there hidden properties attached to regions of the gameworld that affects what mechanics are applied to that region.
If the former, what you might be able to do is to make a platform that's designated as the area where new types of blocks will be edited in, perhaps 10x10 bricks, and towered however high you want it.
Think of it as a temple, through which the gods deliver things to your world.
