Gamers can stream the conference on their 3DS.
http://www.nintendoworldreport.com/news/30422
Yesterday's Nintendo Direct event is streamable in its entirety on the eShop in Japan. The Japanese version runs a little bit shorter than the English language version (about a minute shorter), possibly due to the lack of explanation of the kanji for dokusÅ (meaning “creating something uniqueâ€) and the fact that President Satoru Iwata speaks Japanese faster than he does English.
UPDATE: The Nintendo Direct event video is now available on the eShop in territories outside of Japan. E3 game video downloads are promised.