I'm liking the new biomes, but I hope they take this as an opportunity to add some new biome-specific mobs. The ice-spike biome is calling out for a hostile yeti mob, and there could be ogres or something in the podzol forests. And passive mobs shouldn't spawn in every biome, finding cows and such in a jungle is a little silly. Even skin variants would go a long way to adding some variety, such as pigs with boar skins in forests and woolly-looking cows in snow biomes. There's something like 16 different variations of horses in the game, why not show the other animals some love?