Played this for about 20 minutes to get a general feel for the game. The adventure mode is a very nice addition to the game, and the dream events are very fun to play, although some of the stylus-only events are annoying to control.
On the topic of dream events, some of the racing ones remind me of Mario Kart Wii; in fact, some aspects of it seem like almost exact copies (most noticeably the item boxes, drifting, and the air-tricks). Nintendo, please make another Mario Kart for DS based on this engine. =/