yeah, a mystery gift. instead of getting a secret key, you get the GS ball!
Might be interesting.
News: ! =D =D =D The fact that those two gold and silver things are mentioned adds credit, the fact that the three Johto starters are in the movie adds credit, the fact it's a heavily talked about game adds credit, the Johto Location makes the theory up technically, and the massive amounts of Johto References in the animes and games just adds credibility. =D
Oh, from Serebii:
New Game Announcement
Earlier today, in the Pokémon Sunday variety show and it's website, it was announced that, during their episode next week, they shall reveal a world-exclusive bit of news. Their website states this will be done within the Game Area of their show so it is more than likely a brand new game. There is much speculation as to what the game is, with the general consensus being a Gold/Silver remake which does match up with some new figures of Chikorita, Cyndaquil & Totodile being released in Japan on September 19th 2009, but nothing is confirmed yet, so if you see other sites reporting it as a specific game, remember it is not confirmed that it is that game. CoroCoro is also due out soon after that so that should also contain information on the game announcement. We'll bring you more on this as it happens so keep your eyes here
Figures = Like the preorder offer for Plat?
Either way... In a week, we'll find out.