I have heard a rumour that the whole wilderness will be reset when 1.7 comes so make room for new biotypes. True or not? If not, how will the new biotype appears?
When the wastelands reset, it will have the new 1.7 biomes. When 1.7 comes, if you venture out far enough in the wilderness(into unloaded chunks), it will generate 1.7 biomes.