No one is talking about the new command /gamerule. It lets you control very specific areas of the game. Here are the acceptable variables: doFireTick, doMobLoot, doMobSpawning, doTileDrops, keepInventory, mobGriefing.
Off the bat, I assume doFireTick has something to do with fire, although I didn't notice anything unless causing all fire to be infinite. doMobLoot probably prevents mobs from dropping anything on death. doMobSpawning is probably meant to allow hostile mobs to only spawn from things like Mob Spawners and dispensers. doTileDrops might have to do with falling blocks like sand or in general items dropping to not happen. keepInventory is clearly keep your inventory on death. And mobGriefing is most likely preventing creeper explosions from doing harm, as well as some other bad sides like Blazes setting fire to everything.
Poll