Details about the game are pretty sparse right now. A few folks from other gaming sites, like Michael McWhertor of Polygon, did get some hands-on time with an early build of the title and initial impressions are favorable. Some of the biggest improvements seem to be to Knack's move set (which has been greatly expanded), a kind of skill progression, better platforming, and more interaction between co-op players. Couch co-op is returning (as is drop-in/drop-out) for the campaign and there will be some different paths you can take in the levels for an easier or harder experience.