The game is so good, you'll be a fool to hold out for $30.
The PS4/X1 versions will probably launch at $40 or $50.
As far as visuals go, due to it's art style, the game can't benefit much more from stronger hardware.
e=mc^2
Gaming on: PS4 Pro, Switch, SNES Mini, Wii U, PC (i5-7400, GTX 1060)