Normal wolf spawn when there is new wolf variations

If different variations of wolves come to the game and spawn in certain biomes, where will the original wolf spawn? Well, i think the original wolf will spawn in the following biomes: these biomes are: Oak Forests, Wooded hills, Birch Forests, Tall Birch Forests, Birch Forest Hills, Tall Birch Hills, Plains and  Wooded Mountains. This allows for the original wolf to still be a common spawn, but also allows for other wolf types to be found in-game.