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The hostile underground
Y=59 and below now contains new enemies - the Miner and the Cavecreep.
Cyclops in a Roofed Forest
Cyclops is a new neutral mob that spawns in all biomes where you can meet most passive mobs.
The rare ones
The Martyr and Wither Skeleton Horse are very hard to find.
The main End island
If you thought Ender Sentinels were bad enough, Ender Phantoms will begin to spawn once you've defeated the Dragon.
Outer End islands
The End Barrens now contain new hostile and neutral mobs for you to farm.
Demons
Demons replace Skeletons in the Nether. This new powerful foe will give you a run for your money.
The Nether wildlife
Aside from peaceful Scoopers the Nether is now filled with new dangerous mobs, such as the Nether Spider.