Minecraft: Pocket Edition added ocean monuments in the 0.16.0 update. While these unique structures have been available in other versions, this is the first time you can explore them in PE. With the addition of the ocean monument, there are new types of blocks (prismarine), new mobs (guardians and elder guardians), and something that makes spawning on an island seed even more exciting.
This seed puts you on the edge of snowy biomes. There are cold taiga, ice plains, small mountains covered in snow, and a snow village with three chests. Even though snow if the focal point, you can also find a taiga to your left and a plains biome behind you. After you see the village in the snow, you may not care about warmer climates, however.