Shulk is a hype character regardless of if you know him or not. No one is going to forget any of the characters revealed at E3... I had no idea who Pit was and now Kid Icarus is one of my favorite franchises. Little Mac is similarly popular. Hardly any of my friends knew who he was, but everyone is excited to play as him. To a lessor extent, I had no idea who Greninja was since I stopped playing Pokemon in gen 3, but it is hard to deny that he's a cool character. Rosalina, I knew her and would have never guessed she would be in, but her move set is unique and great. Sakurai has done an amazing job with the newcomer trailers. If you actually read a good portion of this thread (which I doubt) you'd have faith in Shulk as numerous supporters and even those who do not frequent the thread have made convincing arguments. Smash Bros serves as the gateway drug to other Nintendo Franchises....Biggest example is Fire Emblem. X needs all the exposure it can in order to maximize sales and hype, so what better way to do so than with one of the most well known video game franchises and arguably the biggest presence at E3, Smash Bros. If X is as good as Xenoblade, then the franchise is definitely going to be seen as the modern Mother or Earthbound or gain what you refer to as star power. In terms of star power for E3 hype, I'd argue Villager and WFT were not hype worthy, but that's just my opinion and I respect other's decision to disagree. Obviously I'm not claiming Shulk is a definitive E3 reveal, but I think there is a good chance and I'm confident he is in the game.
There's my long response after not replying to this after the past few pages.
In other news, here is a random Xenoblade quiz that places you as a character.
http://www.theotaku.com/quizzes/view/3018/which_xenoblade_character_are_you?
I got Shulk.. yay for me. Although I don't like the picture, it is fitting considering he is my favorite character in the game.