15.0 UPDATE

So 15.0 Minecraft Pocket Edition Update is amazing! For one fact we have horses, saddles and horse armour. We can also ride pigs which is amazing. There are leads and spawn eggs for horses, donkeys, skeleton horses and zombie horses. There is also an Xbox connection thing which confuses me and if someone could explain it to me in the comments I would like that a lot.There is a new title screen which shows you skin on the main screen. The leather horse armour is a cool thing, in myopinion it looks good on white horses. There is also potion effect arrows for example there are poison arrows that if you shoot someone or something with it using a bow obviously they would get poison effect.
There are also pistons and this thing called an observer again it would be amazing if you could tell me what an observer is. We also have a zombie like mob called a husk and a ghost skeleton thing called a stray.