When you say there will still be a tutorial, what do you mean? Do you mean you'll keep it with interiors and such? And overall, you're saying the game won't let you use interiors or terrains? Loading maps with them will end up blank or some awkwardness? You seem to be saying they'd all still work, but will no longer be included by default since they won't work with new lighting.
Don't grasp at straws. Interiors will not load or render. If you try it will just give you a non-fatal error message.--kompressor