You go to the App Store and go to the updates section, if there is an update for Minecraft PE you'll see it, tap it and click update. Enter your apple ID password and it will start updating.
cant do it yet, but in future updates, you probably will
2014-2015 besides 0.8.0 has come out, look out for updates!
Minecraft PE 0.9.0 update is the best as it has new updates that are better than before.
Currently, you cannot change day to night but it is thought to come in a few updates.
Yes. It is possible to crouch in the minecraft pe.
there are no mods in minecraft pe i hope there will be
There are no mods for Minecraft PE But it would be cool
If you have already purchased Minecraft PE, then update the game.
Minecraft PE 0.8.0 does not have squids in it.
there is no jungle biome in minecraft PE
there are no rumors for minecraft pe version 4.1