As for anything released at gamescom, it will be made immediately available for the public. No worries there!
I think the key word is released here. The extended trailer hasn't been released. Kinda the opposite, kept captive.
All in all, it's not the biggest deal in the world. They've followed the letter of what they said, even if not exactly the spirit of it, and that's perfectly within their rights. Especially when they do need to play the media game, and give the press something to chew on.
As for it leaking out via phone, if it hasn't already it's not gonna, not by the media or Peter. The only way it would have anyway was if YSnet were okay with it, and if that was the case they could maybe have released the whole thing in the first place. If the media secretly films it, it's a breach of integrity and could get the leaker fired. If Peter films it, it's a breach of the trust of Yu Suzuki so he's obviously not going to do that.
We'll have to live without that extra minute & change for now.