Many Nintendo IPs had their game mechanics tweaked here and there this E3. Still, Kirby's Epic Yarn underwent the largest transformation. Unfortunately to many gamers it was transformed a little too much.
The new concept, everything is made of yarn, is fun and the graphics fit in incredibly well as such. You can do cool things like pull a string that is sewn into the cloth backdrop which will fold the scenery, making a long jump short enough to cross.