Minecraft wiki entry for The_Update_that_Changed_the_World, associated text: Acacia (Savanna Biome) and Dark Oak (Roofed Forest biome) trees, wood, planks, slabs, and stairs.
See trees for more info.
3 new fish:
Salmon, Clownfish (now called tropical fish), and Pufferfish.
See fish for more info.
10 new flowers added as decoration and/or more easily retrievable dye ingredients
Roses removed and replaced with poppy.
Blue Orchid, Allium, Azure Bluet, Tulips, Oxeye Daisy, Sunflower, Lilac, Rose Bush, and Peony.
See flowers for more info.
Potion of Water Breathing
Made by brewing a pufferfish with an awkward potion.
See fish or Brewing for more info.
Stained Glass and Stained Glass Panes.
Made using a square of 8 glass around a single dye in the middle.
See Stained Glass for more info.