I'm sure most people don't read Japanese here so I'll summarize what happened.
http://www.z-z-z.jp/BLOG/log/eid996.html
Famitsu.com, as many people know, a large game news site (magazines, etc.), and basically all Japanese game media were simply not invited at all.
So some of them actually went ahead and flew themselves to Seattle to see if they could actually attend the event. They were rejected right there and were told to view the stream online.
I know they don't really care about the Japanese market after how 360 sold there but this surely isn't good PR.