The latest update at the Smash Bros. Dojo contains two new tidbits that everyone here is sure to enjoy.  World 1-1 from Super Mario Bros. will be appearing as a battle stage... a side scrolling battle stage, somewhat akin to Rainbow Ride in Super Smash Bros. Melee, but moving towards the right and much more amazing... especially with the piano remix of the Super Mario Bros. theme, by Kondo himself.  It also seems that the level changes to World 1-2 at times.

It's a great time to love Mario.

View the stage on the Dojo here.
Hear the music on the Dojo here.

Source: Smash Bros. Dojo