I don't see why creepers would be too hard, I mean TNT has been added and zombies try to get close to you, so if they just pu the 2 together and take away the zombie attack and put a creeper skin over it then it'd be a creeper, all they have to do is put em together, although I know programming is hard so I'm not sure if they can do that
I would suggest workd wide server hosting.
Since mojang are trying to make pocket edition different from the pc,
They should add Pyramids as generated structures with a maze like inside.
At the end of the maze their should be a dungeon made of heiroglypgh stone
(what ever it is called) in the dungeon there should be a spawner which spawns
Mummies should drop old rags
Old rags should be crafted into armour
The armour (old rag vest, old rag turban, old rag socks, old rag leggings.