Fortunately, Nintendo is well aware of this desire, so in a recent Treehouse: Live event, they spent nearly half an hour showing off some pure, unadulterated gameplay footage.  The video itself includes several characters and stages, so you should come away with a pretty solid understanding of what all Link and Co. will be getting into.  There's a brief discussion among the hosts at the beginning of the video, so if you're wanting to skip directly to gameplay, you'll find it almost exactly a minute in.