For a formative language, it would be wise for Apple to send a representative and for dotSwift to get Apple officially represented. I am sure the organizers understand this, but this would also mean a cultural departure for Apple.
I am curious what such a representative could offer that would not be better in a produced video distributed by Apple?
Plus, watching a HD video shot in a Theater like ours is arguably more enjoyable and impactful than something shot in a studio. You can check this as an example: https://www.youtube.com/watch?v=GLQyj-kBRdo