I'm not sure if that completely qualifies as an answer to the question...
Will PE eventually give players the ability to place water in-game, without resorting to creating water with the World Editor?
I'm really hoping for some way to fill up a bath tub, jacuzzi, kitchen sink, or water garden pond (or perhaps something even larger) with a tool or vehicle of some type. We can water plants in our farm plot. And we can create and use a Water Pump to gather water, but it currently does not allow us to dump
that water on the ground to fill up something.
Also, I think it'd be neat to be able to 'stock' or 'restock' a pond with fish somehow. To do that, though, we'd need some way to capture and transport small fish without killing them.