I'd really like them to add the character from Atari 2600's Adventure (I call her Dot).
She could summon Knubberrub, Yorgle and Grundle as assists and Rhindle as an ultimate.
The "bridge" item would break the game so bad it would be awesome...
I think it would be pretty nice to see the "final" release (the actual release) being different from this leaked one, and that this leaked one is just a mockup version. (of course this won't happen, but still...)