As much as I liked terrains and interiors I don't think it would be a good idea, it would confuse people who are going to purchase blockland, and then if they buy it for an old version and can't find terrains their just going to get angry and rant about it in the Help section.
If people knew it would be a good thing though.
Its kind of one of those good and bad at the same time kind of things, like a double edged sword.
Poll