Mojang releases the 0.9.0 snapshot for Minecraft Pocket Edition, which includes infinite worlds, new physics mechanics for gravel, sand, lava, and water, and many new blocks including mycelium and emerald. Before this point, the Pocket Edition smartphone application only supports worlds that are 256 by 256 blocks wide and lacks many of the blocks present in the PC game. The snapshot is posted on the Mojang blog for users to download:
The Pocket Edition team are a hard-working bunch. Their most recent snapshot is the biggest update to Minecraft: Pocket Edition so far! It really is massive.