Video IMHO is fake. Platinum's not even out everywhere, and also Coro Coro magazine just came out around the same time with no info on this. Plus this info has been on those websites for a while now, yet nowhere else is it mentioned (say, serebii). Which makes me kinda doubtful of it all the more. If it was announced somewhere official, we would have known about it when it happened.
On the website itself, after translating also - the Orange Islands are mentioned. Which was an anime-only thing - not in the games, and I see little reason for it to be in a game by Game Freak. And box art to come along with initial announcements doesn't really happen all that often either with any game.
So I'm finding this all very suspicious, tbh. =/