Minecraft wiki entry for The_Update_that_Changed_the_World, associated text: 11 new biomes
Mesa, Mega Taiga, Roofed Forest, Birch Forest, Flower Forest, Savanna, Extreme Hills+, Deep Ocean, and snowless Taiga.
See Biomes
20 new technical biomes
AMPLIFIED world type
7 new commands
New particle effects
6 new achievements
4 new statistics
2 new tree types, wood, planks, slabs, and stairs