Not necessarily in terms of announcements but just in terms of raw presentation last years E3 was easily the best one they've done by a country mile. The event it's self was well paced (relative to the other conferences in 2014) and being prerecorded allowed for higher production values than a stage show (Robot Chicken, Reggie Fils Anime, Wool Shop, Aonuma and Koei Tecmo sitting down to discuss Zelda over tea, Zelda appearing at the click of Aonuma's fingers, the splatoon aquarium) as well as being aired simultaneously in multiple different languages with the choice between subs or dubs in the case of English. Then there were the other 3 prongs being the public demos, the daily live stream and the tournament.
As for Punch-Out I don't think this is a tease since I recognise the outfit from the "Smash September Training Montage" video. Implying it's NOA's generic training outfit prop rather than Little Mac's. Although it could go either way at this point.