The Live Letter is planned to be in Japanese because that's the primary language spoken by the people presenting the live letter. Obviously, they aren't comfortable delivering the letter in a language not their own, although we will be getting a translation and live preview of whatever it is they have to talk about, including a Q+A translation like we usually do via the forums.

I don't quite understand the end of your post and I assume it is getting to the point of hyperbole, but of course the other events will be in English...