OMG! YES! I actually logged onto these forums with the intention of asking that EXACT same question! I am glad you beat me to it! According to the E3 website,
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ATTENDEE REGISTRATION POLICIES
E3 is a professional trade event and is not open to the general public. Individuals who are not able to document their direct and current professional affiliation to the interactive entertainment industry are not qualified to attend.
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'Tis too bad. Might be kinda cool to shake Yoshi-P's hand in person and try to pick the brains of his dev team too

Oh well.