Mario Maker is an ode to Mario's history, it spans four Mario titles. Game includes four different styles in graphics but also physics; gameplay affects which style you pick. Enemies and items that weren't present in a title have been retoactively added with its according style. New gameplay items are available like packing stuff (boxes, pipes, cannons), stacking, flying, etc; even putting goombas in water! How much freedom the game has we will see, but you should be able to put anything anywhere... no easy task.
We know the game has some pre-made levels. Would be nice if those were set-up as level designer tips, or a campaign covering Mario's history and design choices. Thinking of this, I wonder if Nintendo would let us make our own challenges/tips/traps too via text bubbles.
