I guess between this and Ubisoft's hints in the Sports Connection and Rabbids Land trailers we are getting a peek into what this will be. Thou they are trophies in the UbiSoft trailers. So in conjecture each game gives you some type of trinkets as a reward for you accomplishments in the title and they can be title specfic. And you can choose your favorite to showcase in the MiiVerse much like you could have your Mii say what your favorite things are and what games you have been playing recently on the 3DS.