It's a shame that it's only in America, I knew it woudn't come to Europe though, but like I said, hopefully if new information is revealed i.e English names of Pokémon, Towns, Moves ect. then it will be leaked online within hours after.
With the demos I don't think they'll be on a ROM, they'll just be avaliable at the Event like they did with HG/SS people uploaded videos to Youtube of the Demos which were videos of them playing at the event.
Heck, it will be starting in February 5th so the games will be less than a month a way from release anyway.
I do remember, however demos being held in my home town, this was 2 weeks prior to HG/SS's release.