I was playing with dispensers in Creative mode (LG L7 II) trying to make a complicated system of Cobblestone Farm that's beside the point and accidentally I discovered this: when a dispenser with an empty bucket is activated facing flowing water/lava, the dispenser take the flowing fluid as if it was a source block. It is wrong because with this you can get infinite lava (as we already have infinite water, nothing to worry about it) in Survival using just a dispenser, a bucket, lava and something to active the dispenser, I guess.

"What I expected to happen was...:"
I use a dispenser with empty bucket facing flowing fluids and nothing happens, like when you use an empty bucket in flowing water/lava.

"What actually happened was...:"
I used the above-mentioned dispenser with the equally above-mentioned empty bucket facing flowing water/lava and SHAZAM! The fluid disappeared like magic and a bucket filled with the fluid appeared in the dispenser :O

Steps to reproduce:
1. Put a bucket of water/lava in the floor.
2. Put a dispenser with an empty bucket facing the flowing fluid, not the source block.
3. Power your OP dispenser aka Magical Multiplicator of Fluids and get infinite fluid.

This is all, I expect this to be corrected until the official release. Thanks for reading, have a nice day!