After skeletons and spiders were added in the last update, Minecraft PE is getting much more exciting. Johan Bernhardsson from Mojang announced, "For 0.4.0, we will add creepers and chests. There are still a few bugs but we will hopefully submit the update this week." Creepers have technically been in the game for a few versions, but have been disabled by default (they can be spawned with external tools). Chests have also been in the game, but they were non-functional and could not be opened or used. That's not all though because he also said, "There will of course also be beds and the other feature already announced." He also responded to a follower saying that zombies would drop feathers in the update as well. This is getting exciting!Source: @jbernhardsson