I s'pose I could create a quick facts list for the opening post, based on the write-up I linked to.
Fast Facts
-Designed to be "more challenging and more complex."
-New sidekick character named Pinky.
-2D side-scrolling segments.
-"A" button jumps, no more flicking.
-12 levels in total.
-New moves.
-The "Transform Engine," which colours the surrounding area, is now also a save point.
-Co-op mode, where players can hop in and drop out on the fly.
-4-player battle mode returns.