Well, technically there was a Demo at E3 it just wasn't allowed to be played by the general public. By this I mean that a demo was shown, but only one match was played by a very lucky random dude (I should have been there >.<, I was looking at another booth at the moment, saving Nintendo for last because it's were I was going to stay the longest). So basically, yes, there was a Demo, but no, no one was able to play it. Anyways, the existance of the demo means that technically some select few people (like M2K) could have been invited to play it somewhere else while the general public was enjoying Wonderful 101 and Mario Kart 8 (both awesome games btw, and Pikmin 3, loved it).